Kẻ đường cao BH
⇒ABCH là hình chữ nhật
đặt DH=x
⇒CH=25-x
Theo hệ thức lượng choΔBCD có:
DH.HC=BH²
⇒x(25-x)=144
⇒x=9
Vậy DH=9cm
CH=25-9=16cm
XétΔBHC có:
BC=√BH²+√CH²=√12²+√16²=20(cm)
XétΔBCC có:
BD=√CD²-√BC²=√25²-√20²=15(cm)
I insist you do this. No matter what happens, I will ____ the consequences of my actions. A refuse. B. confirm C. accept D. deny Giải thích rõ ràng nhé
Mọi người giúp mình thuyết trình bài 5.2 SBT trang 86 (Lớp 8 tập một) với ạ
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Mn giúp em với ạ(vd 2) . Em cảm ơn trước ạ ❤
I. Choose the best answer: 1. What school...........................? A. do you study B. does you study C. are you study D. you study 2. Viet Nam is a........................ A. language B. nationality C. country D. village 3. Her parents live................Ha Noi. A. on B. at C. in D. of 4. How...........apples are there? A. much B. more C. may D. many 5. .......... is your house? It is on Nguyen Du street. A. Who B. When C. Where D. What 6. The meeting will last........7 a.m ..........5 p.m. A. from..to B. from...in C. from...at D. from....on 7. ............ good friends. A. Jane and I B. I and Jane is C. I and Jane D. Jane and I are 8. Mary – her, Tom - ......... A. her B. them C. his D. he 9. There aren’t......pictures on the wall. A. any B. some C. a D. an 10. How ........you........? A. do, feel B. does, feel C. do, feels D. does, feels 11. Are they going to see the.......in Hue? A. Cham museum B. Citadel C. Ngoc Son Temple D. Huong pagoda 12. How much rice .......your mother .....? A. do, need B. does, needs C. do, needs D. does, need
Tìm lỗi sai và sửa+ giải thik. Giúp với!!!!!!
Question 43: It was careless of you to leave the windows open last night. A. You might have been careless because you left the windows open last night. B. You shouldn't have left the windows open last night. C. You were so careless that you left the windows open last night. D. You shouldn't leave the windows open last night. Question 44: “We lost the last game because of the referee,” said the team captain. A. The team captain said that without the referee, they might have lost the last game. B. The team captain admitted to the referee that they had lost the last game. C. The team captain refused to tell the referee about their loss in the last game. D. The team captain blamed the referee for their loss in the last game. Question 45: Her family last ate out two weeks ago. A. Her family didn’t eat out two weeks ago. B. Her family haven’t eaten out for two weeks. C. Her family have eaten out for two weeks. D. Her family have two weeks to eat out. Question 49: The design is not impressive. The big column makes the living room ugly. A. Unless the big column makes the living room ugly, the design won’t be impressive. B. Provided the big column made the living room ugly, the design would not be impressive. C. But for the big column in the living room, the design would be impressive. D. The design would be impressive if the living room had a big column Question 50: The coach changed his tactics in the second half. His football team won the match. A. But for the coach's change of tactics in the second half, his football team wouldn’t have won the match. B. Not until his football team had won the match did the coach change his tactics in the second half. C. Only if the coach had changed the tactics in the second half could his football team have won the match. D. Had it not been for the coach’s change of tactics in the second half, the football team would have won the match Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 5: A. suprising B. positive C. colourful D. difficult Question 6: A. money B. picture C. story D. police Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 7: The rooms in Star Hotel are ____ Patterson Hall. A. larger than B. larger than that of C. larger than those in D. larger than in Question 8: Jessica looks very tired. She ______ up late to finish her assignment last night. A. would have stayed B. should have stayed C. can’t have stayed D. must have stayed Question 9: Since all vehicles were banned from the city centre, the air has been safe _______ pollution. A. about B. apart from C. from D. against Question 10: It takes me about an hour to get ready ________work each morning A. in B. on C. for D. with Question 11: They _______ dinner when someone knocked on the door. A. were having B. are having C. have had D. have Question 12: In some countries, many old-aged parents like to live in a nursing home. They want to _______ independent lives. A. give B. lead C. take D. see Question 13: Nobody knows who invented the wheel, _______? A. do they B. don’t they C. does it D. doesn’t it Question 14: My main _____________is to become an environmentalist A. purpose B. ambition C. emotion D. want Question 15: The office is __________ a long way that I have to catch two buses A. such B. too C. enough D. so Question 16: My grandad was an assistant and he was _________in his career A. success B. succeed C. successful D. successfully Question 17: This monument ______ in the 17th century. A. has been built B. was built C. has built D. is built Question 18: If the technology _______ available, we would be able to expand the business. A. would become B. were become C. had become D. became Question 19: Parents have great hopes or great _________when they send their children to school. A. wishes B. obligations C. expectations D. plans Question 20: Her latest bestseller _____ last month. A. came out B. went out C. pulled out D. broke out Question 21: You should be able to save a little money with a/ an _________of 50,000 dollars per year A. income B. leader C. application D. goal 40 điểm cho bạn nào làm được ^^
Bếp Hoàng Cầm ta dựng giữa trời Chung bát đũa nghĩa là gia đình đấy Võng mắc chông chênh đường xe chạy Lại đi, lại đi trời xanh thêm. Dựa vào khổ thơ trên, hãy viết một đoạn văn diễn dịch khoảng 12 câu để làm rõ tình đồng chí đồng đội và phong thái ung dung, tinh thần lạc quan phơi phới của người chiến sĩ lái xe Trường Sơn. Trong đoạn có sử dụng câu mở rộng thành phần và câu cảm thán (Gạch chân và chú thích rõ)
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