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ngocyendh2007
2 năm trước
Cho tam giác ABC có hai đường trung tuyến AD và BE vuông góc với nhau tại O (E thuộc AC,D thuộc BC). Giả sử AC=b,BC=a,hãy tính diện tích hình vuông có cạnh là AB theo a và b.
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Các câu hỏi liên quan

1. Choose the best answer 1. She is...........TV in her room A. watch B. watches C. watching D. to watch 2. What....your father do last night? She reads a book. A. do B.does C.did D.doing 3. ....you want to go to the supermarket with me? A. Do B. Does C. Was D. Were 4. What time do you go to school, Mai? A. Yes, at 6.45 a.m B. 6.45 a.m C. At 2.45 a.m D. At 6.45 a.m 5. How many........do you have today? A. subjects B. subject C. pupils D. children 6. My father.......a book everyday. A. reads B. readed C. reading D. rode 7. Nam is good........Music, but he is bad.....English. A. at/in B.in/at C.at/to D.at/at 8. We....and....at the party on Sunday. A.sing/dance B.sang/ danced C.sings/ dances D. sang/ dance 9.At school, we learn....a lot of things. A.in B.at C.to D.about 10. His father always.....coffee for breakfast. A.drink B.drinks C.is drinking D.are drinking 11. Where.....you usually......in the evening? A. do/ go B.are/ go C.are/ going D.do/ going 12. In....we learn how to use a piano. A. English B. Music C. Math D. P.E 13. The boy.....his teacher some beautiful flowers. A.like to give B.live giving C.likes gives D.would like to give 14.They write emails......their friends every day. A.to B.for C.with D.in

Nối câu sử dụng các từ: so, too ( 8pts ) Ex: I watched TV. He watched TV  I watched TV and he did, too.  I watched TV and so did he. 1. They can play volleyball. We can play volleyball. ............................................................................................................................ ............................................................................................................................ 2. Mr. Tam will come to the party tonight. His wife will come to the party tonight. ............................................................................................................................ ............................................................................................................................ 3. She is learning English. I am learning English. ............................................................................................................................ ............................................................................................................................ 4. I’m a doctor. They are doctors. ............................................................................................................................ ............................................................................................................................ 5. They must go to bed early. You must go to bed early. ................................................................................................................................. ................................................................................................................................. 6. He got up late. I got up late ................................................................................................................................. ................................................................................................................................. 7. They drank milk. We drank milk ................................................................................................................................. ................................................................................................................................. 8. She buys some bananas. We buy some bananas. ................................................................................................................................. .................................................................................................................................

Nối câu sử dụng các từ: so, too ( 8pts ) Ex: I watched TV. He watched TV  I watched TV and he did, too.  I watched TV and so did he. 1. They can play volleyball. We can play volleyball. ............................................................................................................................ ............................................................................................................................ 2. Mr. Tam will come to the party tonight. His wife will come to the party tonight. ............................................................................................................................ ............................................................................................................................ 3. She is learning English. I am learning English. ............................................................................................................................ ............................................................................................................................ 4. I’m a doctor. They are doctors. ............................................................................................................................ ............................................................................................................................ 5. They must go to bed early. You must go to bed early. ................................................................................................................................. ................................................................................................................................. 6. He got up late. I got up late ................................................................................................................................. ................................................................................................................................. 7. They drank milk. We drank milk ................................................................................................................................. ................................................................................................................................. 8. She buys some bananas. We buy some bananas. ................................................................................................................................. .................................................................................................................................

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