cho a+b+c=10 10(ab+bc+ac) = abc tính 1/a^5 + 1/ b^5 + 1/ c^5

Câu 10: Are the____chasing the other farm animals? A.Geese. B.gooses. C.goose. D.goosoes

Cho x,y,b,d là số tự nhiên khác 0 Chứng minh:a/b<c/d thì a/b<x.a+y.c/x.b+y.d<c/d

Rút gọn đa thức : 3x ² +7 x ³ - 3x ³ + 6x ³ - 3x ²

Giúp em từ câu 49 vs ạ.E cảm ơn

tìm số tự nhiên n,biết a. -32/-2 mũ n b. 1/2 tất cả mũ 2n-1 c. 4.32< 2 mũ n< 2.256

chứng tỏ 11 là ước của số có dạng abba

Cho x,y,b,d là số tự nhiên khác 0 Chứng minh:a/b<c/d thì a/b<x.a+y.c/x.b+y.d<c/d

VIII. Choose the best answer People in many countries grow fresh water fish from eggs. They move the small fish into lakes and rivers. The fish live and (21) ___________ there. People go (22) ___________ in these lakes and rivers. They enjoy catching fish because fish is also good food. Now the Japanese grow salt water fish. Most of them are yellow tail fish. Workers grow the fish from eggs. Every time they feed the fish, they play (23) ___________ of piano music. The fish (24) ___________that piano music means food. When the fish are small, the Japanese put them into the ocean near the land. The fish find some of their (25) ___________ food. Workers also feed them. They play the same piano music. The fish (26) ___________know the music. They swim toward it and (27) ___________ the food. In (28) ___________months the fish are large. The Japanese play the same music. The fish swim toward it and the workers (29) ___________ them. The Japanese get about 15 percent of their seafood (30) ___________farms in the ocean. 21. A. bread B. born C. grow D. develop 22. A. enjoying B. fishing C. shopping D. catching 23. A. songs B. films C. tapes D. lot 24. A. think B. recognize C. realize D. learn 25. A. own B. own’s C. self D. self’s 26. A. recently B. mostly C. nearly D. already 27. A. see B. find C. bite D. hold 28. A. few B. a few C. couple D. many 29. A. grasp B. catch C. seize D. hold 30. A. on B. of C. from D. in

VII. Supply the correct form of the word in brackets. Architects responsible for the..1………………….(construct) of many skyscrapers believe that a tall building must always have a certain minimum..2…………………...(wide) but that there is no limit to its absolute..3……………….(high).This means that the skyscrapers of the future are likely to be taller. Engineers agree with this, but there is..4………………….(agree) over the best shape for every tall, slim buildings. The effects of wind..5……………...(press) mean that cylindrical designs have enjoyed some..6……………….(popular) in recent years, and there are quite pleasing to the eye. ..7………………..(fortunate), however, the ideal shape is an ugly square with heavily rounded corners. Would these tall buildings of the future offer more than a..8…………….(wonder) view ?Some believe tall towers could contain all the..9…………...(require) for modern living.The..10………….. (inhabit) of these vertical villages would travel up and down between their home and work zones and would..11………….(rare) need to journey to ground level.