Bộ đề thi học sinh giỏi cấp tỉnh các môn Khối 9 - Năm học 2020-2021 - Sở GD và ĐT Lạng Sơn (Có đáp án)

Nội dung text: Bộ đề thi học sinh giỏi cấp tỉnh các môn Khối 9 - Năm học 2020-2021 - Sở GD và ĐT Lạng Sơn (Có đáp án)

1. SỞ GIÁO DỤC VÀ ĐÀO TẠO KỲ THI CHỌN HỌC SINH GIỎI CẤP TỈNH LẠNG SƠN LỚP 9 NĂM HỌC 2020 - 2021 Môn thi: Toán lớp 9 THCS ĐỀ THI CHÍNH THỨC Thời gian: 150 phút (không kể thời gian giao đề) Ngày thi: 18/3/2021 (Đề thi gồm 01 trang, 05 câu) Câu 1 (4,0 điểm). x y x y x y2 xy Cho biểu thức: P :1 với x 0; y 0; xy 1. 11 xy xy 1 xy a) Rút gọn biểu thức P. b) Tính giá trị của P với y 9 4 5. Câu 2 (4,0 điểm). Cho phương trình mx2 2 m 2 x m 3 0 ( m là tham số). a) Tìm tất cả các giá trị của tham số m để phương trình có hai nghiệm trái dấu. b) Tìm tất cả các giá trị của tham số m để phương trình có hai nghiệm xx12, thỏa 11 mãn: 22 2. xx12 Câu 3 (4,0 điểm). 22 xy x y x 2 y a) Giải hệ phương trình x2 y y x 1 2 x 2 y b) Tìm tất cả các số nguyên dương x,, y z thỏa mãn phương trình x6 y 6 15 y 4 z 3 75 y 2 3 x 2 y 2 z 15 x 2 z 125. Câu 4 (6,0 điểm). Cho tam giác đều ABC nội tiếp đường tròn OR;. Gọi H là một điểm di động trên đoạn thẳng OA ( H khác O và HA HO ). Đường thẳng đi qua H và vuông góc với OA cắt cung nhỏ AB tại M. Gọi K là hình chiếu vuông góc của M trên OB. a) Chứng minh BMK MAB. b) Các tiếp tuyến của OR; tại A và B cắt tiếp tuyến tại M của OR; lần lượt tại D và E. OD, OE cắt AB lần lượt tại F và G. Chứng minh rằng: OE OG OF OD c) Tìm vị trí điểm để chu vi tam giác MAB đạt giá trị lớn nhất. Câu 5 (2,0 điểm). 1 1 1 a) Cho abc,, là các số thực dương thoả mãn 6. abc2 2 2 b2 c 2 c 2 a 2 a 2 b 2 Tìm giá trị nhỏ nhất của biểu thức Q . a b2 c 2 b c 2 a 2 c a 2 b 2 b) Cho mỗi điểm trên mặt phẳng được tô bởi một trong hai màu xanh hoặc đỏ. Chứng minh rằng tồn tại một tam giác mà ba đỉnh và trọng tâm cùng màu. Hết Họ và tên thí sinh: Số báo danh: Chữ kí giám thị số 1: Chữ kí giám thị số 2:
2. SỞ GIÁO DỤC VÀ ĐÀO TẠO KỲ THI CHỌN HỌC SINH GIỎI CẤP TỈNH LẠNG SƠN LỚP 9 NĂM HỌC 2020 - 2021 HƯỚNG DẪN CHẤM THI MÔN TOÁN LỚP 9 THCS (Hướng dẫn chấm gồm 03 trang) Chú ý: Những cách giải khác HDC mà đúng thì cho điểm theo thang điểm đã định. Câu Nội dung Điểm x y 11 xy x y xy 12 xy x y xy a) P : 0,5 11 xy xy xxy yyx xxy yyx 1 xy . 0,5 11 xy x y xy 2 y x y 0,5 11 xy 1 2 y (4đ) 0,5 1 y 2 b) y 9 4 5 5 2 0,5 2 y 5 2 5 2 0,5 2 5 2 5 P 1,0 1 9 4 5 5 a) Phương trình có hai nghiệm trái dấu mm 30 1,0 0 m 3. 1,0 b) TH1. m 0 0,5 Phương trình 4x 3 0 (Không thỏa mãn yêu cầu) TH2. m 0 2 0,5 Phương trình có hai nghiệm xx12, '0 m 2 m m 3 0 m 4 22 m 2 2 xx12 (4đ) m 11 x1 x 2 2 x 1 x 2 Khi đó và 22 0,5 m 3 xx2 2xx 2 xx 12 12 12 m 2 22 m m 3 2 mm 0,5 2 2 m 1 ( t / m ). m 3 m 22 xy x y x 2 y (1) a) Điều kiện: xy 1, 0 0,5 x2 y y x 1 2 x 2 y (2) Khi đó: 1 x y x 2 y 1 0 0,5 3 (4đ) x 2 y 1 0 x 2 y 1 0,5 Thay vào phương trình (2) ta được: y 1 2 y 2 0 y 2 0,5 y hệ có nghiệm xy; 5; 2 .
3. b) x6 y 6 15 y 4 z 3 75 y 2 3 x 2 y 2 z 15 x 2 z 125. 6 3 2 2 2 6 4 2 x z 15x z 3 x y z y 15 y 75 y 125 0,5 33 xz2 y 2 5 3 3 x 2 z y 2 5 33 Áp dụng BĐT Cauchy ta có VT x2 y 2 5 z 3 3 x 2 z y 2 5 0,5 Dấu "" xảy ra khi x22 z y 5 Phương trình x22 y 55 x y x y 0,5 x y 53 x ()l x y 12 y x y 1 x 3 z 9 0,5 x y 52 y Nghiệm của phương trình là x; y ; z 3;2;9 . a) Qua A kẻ tia tiếp tuyến Ax của (O ). 11 0,5 Ta có MAx MOA sđ AM (1) 22 Có Ax MH (cùng vuông góc với OA ) MAx AMH (2) 11 0,5 MBA MOA sđ (3) 22 Từ (1),(2),(3) MBA AMH (5) OAB cân tại O và AOB 12000 , BAO ABO 30 Gọi NT, lần lượt là giao điểm của MH, MK với AB 0,5 Ta có MTB TBK TKB 1200 , MNA NAH NHA 1200 MTB MNA (6) Từ (5),(6) MNA đồng dạng BTM MAN BMT BMK MAB. 0,5 b) Có: DAO DMO 900 (Tính chất tiếp tuyến) tứ giác AOMD nội tiếp (7) 4 1 1 0,5 GAM sđ BM ; MOG GOB sđ BM (6đ) 2 2 GAM MOG tứ giác AMGO nội tiếp (8) Từ (7), (8) ta có 5 điểm ADMGO,,,, cùng nằm trên một 0,5 đường tròn AGO ADO ODM OGF đồng dạng ODE 0,5 OE OD hay OE OG OF OD 0,5 OF OG c) Trên đoạn MC lấy điểm A' sao cho MA' MA 0 0,5 AMA' đều MAB A' AC 60 BAA ' MAB A'' AC MB A C MA MB MC Chu vi AMA' là 0,5 MA MB AB MC AB 2 R AB Giá trị lớn nhất của chu vi MAB là 2R AB Giá trị lớn nhất của chu vi đạt được khi là 0,5 đường kính của (O ). Khi đó M là điểm chính giữa cung AB
4. Gọi I là giao điểm của AO và BC H là trung điểm đoạn AI 33 0,5 Ta có AI R AH R 24 111 a) Q 1 1 1 1 1 1 a 2 2 b 2 2 c 2 2 c b a c b a 1 1 1 Đặt x,, y z thì x, y , z 0 và x2 y 2 z 2 6 a b c x y z x2 y 2 z 2 Q y2 z 2 z 2 x 2 x 2 y 2 x 66 x22 y y zz 6 2 Áp dụng BĐT Cauchy cho ba số dương ta được 2223 2 22 1 2 2 2 1 2xxx 6 6 0,5 x 6 x 2 x 6 x 6 x 32 2 2 3 x2 2 x 6 x22 4 2 x xx 6 2 8 yz2222 Tương tự yz22, y 66 y22 88 z z 2 3 2 Do đó Q x2 y 2 z 2 84 0,5 1 Đẳng thức xảy ra khi x y z 2 hay abc 2 5 32 (2đ) y giá trị nhỏ nhất của Q là . 4 b) Lấy 5 điểm tùy ý sao cho không có ba điểm nào thẳng hàng trên mặt phẳng. Khi đó vì chỉ dùng hai màu để tô các đỉnh nên theo nguyên lí Dirichlet phải tồn tại ba điểm trong số đó cùng màu. Giả sử ba 0,5 điểm đó là ABC,, màu đỏ. Khi đó tam giác ABC với ba đỉnh màu đỏ. Gọi G là trọng tâm tam giác ABC. Khi đó chỉ có hai khả năng xảy ra 1. Nếu G màu đỏ thì ABCG,,, cùng màu và bài toán được chứng minh 2. Nếu G màu xanh, kéo dài GA,, GB GC và lần lượt lấy trên đó các điểm ABC', ', ' sao cho AA' 3 GA , BB ' 3 GB , CC ' 3 GC . Khi đó, nếu gọi MNP,, tương ứng là trung điểm của BC,, CA AB thì AA' 3 GA 6 GM AA ' 2 AM . Tương tự, BB' 2 AN , CC ' 2 CP . Do đó các tam giác A',',' BC B CA C AB tương ứng nh n ABC,, làm trọng tâm. Mặt khác, các tam giác ABC và ABC''' có cùng trọng tâm G. 0,5 Có hai trường hợp 2.1. Nếu ABC', ', ' có cùng màu xanh thì tam giác ABC''' và trọng tâm G cùng màu xanh 2.2. Nếu ít nhất một trong các điểm ABC', ', ' màu đỏ, không giảm tính tổng quát, giả sử A' màu đỏ. Khi đó tam giác A' BC và trọng tâm A màu đỏ. y trong mọi khả năng luôn tồn tại một tam giác có ba đỉnh và trọng tâm cùng màu.
5. A. in B. at C. on D. with 9. It is essential that Mary ___ able to speak English. A. is B. be C. was D. must be 10. They just ___ the pedestrian for the accident. A. blamed B. accused C. charged D. sued 11. Although she arrived ___, we made her welcome just the same. A. expected B. unexpectedly C. unexpected D. expectedly 12. No sooner ___ the house than it started raining. A. we left B. had we left C. we had left D. did we leave 13. I’d like to ___ an appointment to see the doctor. A. do B. say C. organize D. make 14. I’m sorry; I forgot ___ your letter. It is still here, in my pocket. A. post B. to post C. posting D. posted 15. ___ the weather forecast, it will rain heavily later this morning. A. On account of B. According to C. Because of D. Due to 16. Julia is truthworthy. She’s a person upon ___ you can always depend. A. who B. whom C. that D. whose 17. If you hadn’t watched that late movie last night, you ___ sleepy now. A. wouldn’t be B. wouldn’t have been C. might have not been D. wouldn’t have been being 18. Minh: “Excuse me, is anybody sitting here?”- Jean: “___.” A. No, thanks B. Sorry, the seat is taken C. Yes, yes. You can sit here D. Yes, I am so glad 19. The school was closed for a month because of the serious ___ of the Covid-19 pandemic. A. outcome B. outburst C. outset D. outbreak 20. A large number of students in this school ___ English quite fluently. A. speaks B. is speaking C. has spoken D. speak Your answers: 1. 6. 11. 16. 2. 7. 12. 17. 3. 8. 13. 18. 4. 9. 14. 19. 5. 10. 15. 20. Part 2: Write the correct form of each bracketed word in the corresponding numbered boxes. 1. I became ___ aware that no one else was laughing. (COMFORT) 2. He left the room without any ___. (EXPLAIN) 3. She has one of the biggest stamp ___ in Britain. (COLLECT) 4. A free trade agreement would be ___ to both countries. (ADVANTAGE) 5. If the neonate is not treated urgently with prostaglandins, ___ damage can occur to the kidneys and liver. (REPAIR) Your answers: 1. 4. 2. 5. 3. Part 3: The following passage contains five errors in some lines. Underline the errors, and write their correction in the the space provided. Page 4 of 9
6. SO WHAT HAPPENED TO THE ENGLISH LANGUAGE Anyone who wants to learn or use what used to be called “plain English” is unlikely to be disheartened by what has been happening in recent years. In the first place, there has been the proliferate of jargon – terminology devised by the experts to ensure that only they will grab what is being said. Its use is of great value to academics, lawyers and economists since the ordinary citizen is obliged to consult them, usually for a sunstantial fee, to find out what they mean. Far more sinister is the prevention of every day terms to mean something quite different. This is favored by those who regard themselves as “politically correct” – a term that, by implying that only they know what is right, is itself a perversion of language. No doubt it started off with good intentions. It was only natural that the original inhabitants of North America should object to what they were called, since they are neither “red” nor “Indian”, but it is doubtful whether they appreciated being renamed as the predecessors of an obscure Italian navigator. But in their anxiety not to offend anyone, these “idealists” are making nonsense of the language. Those who are shortage of stature may feel happier to be described as “vertically challenged” but what comfort does it offer the very tall, like myself, who feel “vertically challenged” every time we bang our heads? Your answers: Errors Corrections 1. 2. 3. 4. 5. READING (5.0 POINTS) Part 1: Read the text and choose the word marked A, B, C or D that best fits each gap. Write your answers in the corresponding numbered boxes. According (1)___ a magazine article I’ve read recently, we (2)___ live in an age of increasing leisure. Not only are more and more people reaching retirement age with their taste for enjoyment and even adventure relatively intact, (3)___ the working week is becoming shorter and the opportunities for leisure are becoming greater and greater all the time. Not to mention the fact that people (4)___ to spend less time travelling to work or may even be working from home. What I can’t understand, however, is who these people are. As far as I can (5)___ the whole thing is another one of the journalistic fictions. I admit that there are a lot of retired people nowadays but I am not sure (6)___ all of them are dashing about learning hang-gliding or sail single-handed (7)___ the world. My own parents seem to (8)___ most of their time gazing at the television. And as for the shorter working week, I wish someone (9)___ remind my company about it. I seem to be working longer and longer hours all the time. The little leisure time I have is eaten into by sitting in the traffic jams or (10)___ for trains to show up at rain-swept platforms. I haven’t noticed any dramatic improvements in my cost of living either, but perhaps I just have to wait until I get my pension. 1. A. to B. for C. of D. into 2. A. present B. at the moment C. now D. at this time 3. A. for B. and C. so D. but 4. A. use B. tend C. have D. demand Page 5 of 9
7. 5. A. concern B. imagine C. expect D. tell 6. A. which B. that C. when D. where 7. A. round B. over C. through D. into 8. A. have B. use C. save D. spend 9. A. would B. to C. had D. might 10. A. keeping B. lining C. waiting D. setting Your answers: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Part 2: Read the passage and fill in each blank with one suitable word. Write your answers in the corresponding numbered boxes. HOME-ALONE FATHERS The number of (1)___ fathers has increased considerably in recent years in Britain. We spoke to one such dad, Steve Baker, about how he copes with it at all. Steve, 43 years old, has (2)___ up his two teenage sons since he and his wife split up two years ago. “It’s (3)___ more difficult for a man than it is for a woman,” says Steve. “It’s a full-time job, whoever you are. (4)___, my employers were very sympathetic in the first few months and they let me take time off work to get myself organized. As far as the housework is (5)___. I don’t mind cooking, as I’ve always been good at that; it’s the ironing I can’t (6)___! Generally speaking, the boys and I (7)___ on very well together but of course, sometimes we have rows. That’s when I really miss having someone there with me to help (8)___ out. I have had a couple of relationships in the last two years but they (9)___ worked out. That has a lot to do with the fact that I put my kids before anyone else, I (10)___ fatherhood very seriously.” Your answers: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Part 3: Read the passage and choose the best answer to each question. Write your answers in the corresponding numbered boxes. Having reached the highest point of our route according to our plan, we discovered something the map had not told us. It was impossible to climb down into the Kingo valley. The river lay deep between the mountain sides that were almost vertical. We couldn’t find any animal tracks, which usually show the best way across country, and the slopes were covered so thicky with bushes that we could not see the nature of the ground. We had somehow to break through to the river which would give us our direction out of the mountains into the inhabited lowlands. Our guide cut a narrow path through the bushes with his long knife and we followed in single file. Progress was slow. Then, when we thought we had really reached the river, we found ourselves instead on the edge of a cliff with a straight drop of 1,000 feet to the water below. We climbed back up to the slope and began to look for another way down. We climbed, slipped, sweated and scratched our hands to pieces and finally arrived at the river. Happily we strode downhill along its bank without having to cut our way. However, after a few miles the river entered a steep-sided gap between rocks and suddenly dropped thirty-five feet over a waterfall. There was no path alongside it and no way round it. Then one of the guides saw a way of overcoming the difficulty. There was a fallen tree lying upside down over the waterfall with its leafy top resting on the opposite bank below the falls. Without hesitation he climbed down the slippery trunk to show us how easy it was. Having got to the fork of the tree, he moved hand over hand along a branch for four or five feet Page 6 of 9
8. with his legs hanging in space, then he dropped onto the flat bank the other side, throwing his arms in the air like a footballer who has scored a goal, and cheerfully waving us on. 1. Having reached the highest point on their route, the travellers expected to be able to ___. A. track animals to the river B. put away the maps they had been using C. approach the river from a different direction D. get down to the river without much difficulty 2. The travellers wanted to get to the river because ___. A. it would lead them to the waterfall B. it would show them which way to go C. it was the only possible route out of the mountains D. it was a quicker route than going over the mountains 3. One reason why the travellers took so long to get to the river was that ___. A. it was too hot to move quickly B. there was no proper path C. they all tried to go different ways D. they could not follow the animal tracks 4. The travellers were happy when they reached the river because ___. A. they had a sense of achievement B. the going was much easier then C. they were eager to see the waterfall D. they knew they were near their destination 5. To get past the waterfall the guide had to ___. A. use a fallen tree as a kind of bridge B. cross the river above the waterfall C. slide down a steep river bank D. swing across the river from a high branch Your answers: 1. 2. 3. 4. 5. WRITING (4.0 POINTS) Part 1: Finish each of the following sentences in such a way that its meaning stays the same. 1. They do not clean the windows, so the room looks dark. → Were they ___. 2. The bridge was so low that the bus couldn’t go under it. → It was ___. 3. Tim has become confident as a result of his success. → Tim’s success has turned ___. 4. Just after the play started there was a power failure. → Hardly ___. 5. It is believed that the man escaped in a stolen car. → The man is ___. Part 2: Complete the second sentence so that it has a similar meaning to the first sentence, using the word given in brackets. Do not change the word given. You must use between TWO and FIVE words, including the word given. (1 point) 1. I have always admired my father for all the work he does. (LOOKED) → I have always ___ my father for all the work he does. 2. Jane seems to be naturally good at playing the piano. (TALENT) → Jane seems to ___ playing the piano. 3. It’s your responsibility to make sure all books are returned on time. (FOR) Page 7 of 9
9. → You are ___ all books are returned in time. 4. Peter was the first person I asked for advice. (WHOSE) → Peter was the ___ asked for. 5. The twins look exactly the same to me. (TELL) → I can’t ___ the twins. Part 3: In about 150 words, write a paragraph about the advantages and disadvantages of online shopping. Give reasons for your answer and include any relevant examples from your own knowledge and/or experience. ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ Page 8 of 9
10. ___ ___ THE END___ Page 9 of 9
11. SỞ GIÁO DỤC VÀ ĐÀO TẠO KỲ THI CHỌN HỌC SINH GIỎI CẤP TỈNH LẠNG SƠN LỚP 9 NĂM HỌC 2020 - 2021 HƯỚNG DẪN CHẤM THI MÔN TIẾNG ANH LỚP 9 THCS (Hướng dẫn chấm gồm 03 trang) Chú ý: Những cách giải khác HDC mà đúng thì cho điểm theo thang điểm đã định. LISTENING (4 POINTS) Part 1: 0.2 points for each correct answer 1. C 2. A 3. A 4. C 5. B 6. A 7. A Part 2: 0.2 points for each correct answer 8. C 9. B 10. A 11. C 12. C 13. A Part 3: 0.2 points for each correct answer 14. 9.5 18. magic 15. rain 19. bookshop 16. deck 6 20. all times 17. snack(s) PHONETICS (1 POINT) Part 1: 0.2 points for each correct answer 1. C. belonged 2. D. mature 3. A. father Part 2: 0.2 points for each correct answer 2. B. question 1. A. understand LEXICO-GRAMMAR (4 POINTS) Part 1: 2 points (0.1 point for each correct answer) 1. C. chalk and cheese 6. C. intention 11. B. unexpectedly 16. B. whom 2. A. made 7. D. apart 12. B. had we left 17. A. wouldn’t be 3. B. every 8. A. in 13. D. make 18. B. Sorry, the seat is taken 4. C. test 9. B. be 14. B. to post 19. D. outbreak 5. B. have been 10. A. blamed 15. B. According to 20. D. speak Part 2: 1 point (0.2 points for each correct answer) 1. uncomfortably 3. collections 5. irreparable 2. explanation 4. advantageous Part 3: 1 point (0.2 points for each correct answer) Page 1 of 3
12. SO WHAT HAPPENED TO THE ENGLISH LANGUAGE Anyone who wants to learn or use what used to be called “plain English” is unlikely to be disheartened by what has been happening in recent years. In the first place, there has been the proliferate of jargon – terminology devised by the experts to ensure that only they will grab what is being said. Its use is of great value to academics, lawyers and economists since the ordinary citizen is obliged to consult them, usually for a sunstantial fee, to find out what they mean. Far more sinister is the prevention of every day terms to mean something quite different. This is favoured by those who regard themselves as “politically correct” – a term that, by implying that only they know what is right, is itself a perversion of language. No doubt it started off with good intentions. It was only natural that the original inhabitants of North Amarica should object to what they were called, since they are neither “red” nor “Indian”, but it is doubtful whether they appreciated being renamed as the predecessors of an obscure Italian navigator. But in their anxiety not to offend anyone, these “idealists” are making nonsense of the language. Those who are shortage of stature may feel happier to be described as “vertically challenged” but what comfort does it offer the very tall, like myself, who feel “vertically challenged” every time we bang our heads? Your answers: Errors Corrections 1. unlikely likely 2. proliferate proliferation 3. grab grasp 4. every day everyday 5. shortage short READING (5.0 POINTS) Part 1: 2 points (0.2 points for each correct answer) Your answers: 1. A. To 2. C. now 3. D. but 4. B. tend 5. D. tell 6. B. That 7. A. round 8. D. spend 9. A. would 10. C. waiting Part 2: 2 points (0.2 points for each correct answer) Your answers: 1. single 2. brought 3. far/much 4. Fortunately/ Luckily 5. concerned 6. stand/bear/endure 7. get 8. me 9. haven’t 10. take Part 3: 1 point (0.2 points for each correct answer) Your answers: 1. D 2. C 3. B 4. B 5. A Page 2 of 3
13. WRITING (4.0 POINTS) Part Content Points 1. to clean the windows, the room wouldn’t look dark 0.2 2. such a low bridge that the bus couldn’t go under it 0.2 Part 1 3. him into a confident person 0.2 (1 point) 4. had the play started when there was a power failure 0.2 5. is believed to have escaped in a stolen car 0.2 1. looked up to 0.2 2. have a talent for 0.2 Part 2 3. responsible for making sure (that) 0.2 (1 point) 4. first person whose advice I 0.2 5. tell the difference between 0.2 1. Bố cục - Câu đề dẫn chủ đề mạch lạc. 0.5 - Bố cục hợp lí, rõ ràng, phù hợp yêu cầu của đề bài. - Bố cục uyển chuyển từ mở bài đến kết luận. 2. Phát triển - Phát triển ý có trình tự logic. 0.3 - Có dẫn chứng, ví dụ, đủ để bảo vệ ý kiến của mình. 3. Sử dụng ngôn ngữ - Sử dụng ngôn từ phù hợp nội dung. 0.4 - Sử dụng ngôn từ đúng văn phong/ thể loại. - Sử dụng từ nối các ý cho bài viết uyển chuyển. Part 3 4. Nội dung (2 points) - Đủ thuyết phục người đọc. 0.5 - Đủ dẫn chứng, ví dụ, lập luận. - Độ dài: Số từ không nhiều hơn hoặc ít hơn so với quy định 5%. 5. Ngữ pháp, dấu câu và chính tả - Sử dụng đúng dấu câu. - Chính tả: Viết đúng chính tả. + Lỗi chính tả gây hiểu nhầm/ sai lệch ý sẽ bị tính một lỗi (trừ 1% điểm 0.3 của bài viết). + Cùng một lỗi chính tả lặp lại chỉ tính là một lỗi. - Sử dụng đúng thời, thể, cấu trúc câu đúng ngữ pháp (Lỗi ngữ pháp gây hiểu nhầm/ sai lệch ý sẽ bị trừ 1% điểm bài viết.). ___ THE END___ Page 3 of 3