Cho các số x,y là các số thực không âm thỏa mãn x+y = 1. Tìm giá trị nhỏ nhất của biểu thức A = $x^{3}$ + $y^{3}$

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EX1: VLC 1. “Why don’t you put better lock on the door, Barbara”? said John => John suggested…………………………………………………………………………………….. 2. Although his both legs were broken in the crash, he managed to get out of the car before it exploded. => Despite his………………………………………………………………………………………….. 3. I haven’t eaten this kind of food before. => This is the first……………………………………………………………………………….. 4. The architect has drawn plans for an extension to the house. => Plans………………………………………………………………………………………………… 5. It isn’t necessary for you to finish by Saturday => You……………………………………………………………………………………… 6. “How many survivors are there?”, asked the journalist. => The journalist wanted to know……………………………………………………………… 7. It was such rotten meat that it had to be thrown away. => The meat was……………………………………………………….. 8. It is essential that Professor Van Helsing is met at the airport. => Professor Van Helsing…………………………………………………………………….. 9. You can’t visit the USA unless you have a visa. => If you……………………………………………………….. 10. “Can I borrow your typewriter, Janet”? asked Peter. => Peter asked if……………………………………………………………..

Giúp hộ Ex3. Finish the following sentences in such a way that it’s as similar in meaning to the original sentences. 13. Peter is too young to see the horror film. → Peter is not ............................................................................................ 14. I do this exercise in three and a half hours. → It takes........................................................................................................................ 15. To see that film is interesting. → It’s interesting........................................................................................................... 16. The test is so difficult that the pupils can not finish it in time → The test is too ............................................................................................................ Ex4-Using the words given and other words, complete the second sentence so that has a similar meaning to the first one. Do not change the word given. 1-Whose bag is this? Belong =>Who does this bag belong to? 2-Shall we use gas instead of burning coal? =>I suggest……………………………………………………….……………………. 3-How about reducing the amount of water we use everyday? =>Why……………………………………………………………………………? 4-What about using energy-saving appliances? =>I think…………………………….……………………………………………… 5-Why don’t you install a burglar alarm in your house. =>I suggest……………………………..……….. …………………………………… 6-What about going out this evening? =>Let’s …………………………………………………………….…………… 7-Let’s collect old clothes. => I think………………………………………….…………………………………... 8-I suggest that you should drink a lot of water. =>Why ……………………………………………………………………………... 9-How about going to work by bikes instead of motorbikes to save energy? => Shall ………………………………………….………………………………..? 10.I think you should eat a lot of vegetables to lose weight. =>How………………………………..………………………………………....