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bmantpl
2 năm trước
Cho tam giác ABC và một điểm O nằm trong tam giác đó. Trên cạnh OA lấy điểm D sao cho . Qua D vẽ các đường thẳng song song với AB, AC lần lượt cắt OB, OC tại E và F a) Chứng minh tam giác DEF đồng dạng tam giác ABC b)Tính độ dài DE, AB biết hiệu độ dài hai cạnh đó là 12cm. giúp mình với ạ :((
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Các câu hỏi liên quan

1/ Her new school is different . . . . . . . . . . . . . . . . . . . . . her old school. A. of B. with C. from D. at 2/ . . . . . . . . . . . . . . . . . . . . . is it from your house to the market? A. How old B. How C. How far D. How long 3/ Is there a picture on the wall? . . . . . . . . . . . . . . . . . . . . . . A. Yes, there be. B. Yes, there is. C. Yes, there is not. 4/ He works . . . . . . . . . a hospital. He takes care . . . . . . . . . . . . . patients. A. in / for B. in / of C. at / for D. for / of 5/ What does your father do? . . . . . . . . . . . . . . . . . A. He’s farmer. B. He does a farmer. C. He’s a farmer. 6/ His car is . . . . . . . . . . . . . . . . . . . . . the shop. A. front of B. behind C. next D. near to 7/ Do you work . . . . . . . . . . . . . . . . . . . . . hours than Hoa? A. few B. less C. lesser D. fewer 8/ She works six days . . . . . . . . . . . . . . . . . . . . . week. A. in B. for C. a D. the Choose the word that has a different pronunciation from the others of each group 1. A. magazine B. mathematics C. manage D. watch 2. A. material B. visitor C. magazine D. want 3. A. brush B. uncle C. wash D. worry 4. A. orange B. wake C. way D. waste 5. A. good B. too C. tooth D. two Complete these sentences with comparative or superlative: 1. This dress is the ………………………………of three dresses.(expensive) 2. Vietnamese students work ……………hours than American sts (few) 3. He has ……………………………….. money than his wife. (much) 4. Summer holiday is …………than tet holiday. It’s the ……… holiday(long) 5. Tom is ………………………… than Peter (intelligent) Rewrite the sentence without changing meaning. 1/ What about going to the movies? → Why . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/ Where does she live? → What . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/ What do you do? → What . . . . . . . . . . . . . . . ....

1. Read the text. Choose the right words and write them on the lines Airports You can fly to places all over (1) ................. world from airports. Planes and helicopters leave and arrive (2) .................. day. You often take a plane from an airport when you go to (3) .................. country on holiday or for work. Some people go to airports because they (4) ............... watching planes there. You can get to airports (5) ................ bus, taxi or car. Sometimes you go there to meet friends (6) .................. are arriving from other places. In most airports there are shops, cafés and toilet. People (7) ................. buy things before they get on the plane. These things are usually cheaper in airports (8) .................... in other shops. You have to wait in a place called the 'departure lounge' befor you fly. A lot of people (9) ................... in airports. People have to clean them all the time because (10) .................... are very big and a lot of people use them. You can see pilots there, too. There are (11) ..................... policemen and policewomen, and mechanics who work on the planes before they fly. 1. a / an / the 2. some / every / any 3. many / another / other 4. enjoys / enjoy / enjoyed 5. by / for / with 6. what / which / who 7. can / are / have 8. that / than / then 9. works / working / work 10. they / it / you 11. twice / also / together

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