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thaohanhdung
2 năm trước
Giúp mk bài này vs !!! Tìm GTLN ,GTNN a, y=sin^20 x + cos^20 x , x thuộc [0,pi/2] b, y=x^6+4(1-x^2)^3 ,x thuộc [-1,1] c, y=5 cosx -cos 5x ,x thuộc [-pi/4,pi/4]
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III. Rewrite the following sentences by 1. I'll buy a new hat. I'll give it to you. If 2. Today isn't Sunnday. The pupils can't go swimming. If 3. He wasn't here. He didn't have a lot of fun. If 4. My brother will have anough money. He will buy a bicycle. If 5. He didn't have time. He didn't read this novel. If 6. Because she missed the bus, she was late. If 7. Peter doesn't study hard, so he can't get good marks. If 8. My sister is absent from her class because she has a terrible headache. If 9. Windy didn't come, so we cancelled the meeting. If 10. He was angry, so he didn't say anything. If_ 11. He can't go out because he has to study for his exam. => If. 12. She is lazy so she can't pass the exam. If.. 13. He will pay me tonight; I will have enough money to buy a car. => If.... 14. He smokes too much; that's why he can't get rid of his cough. => If. 15. She is very shy, so she doesn't enjoy the party. => If... 16. I will get a work permit. I will stay for another month. => If. 17. He doesn't take any exercises. He is so unhealthy => If.... 18. We can't get the ticket because I don't have the right change. => If. 19 Study hard or you won't pass the exam. => If...... 20. Don't be impatient or you will make mistakes. => If....... 21. I didn't eat lunch, I feel hungry now. => If I..... 22. If you want my advice,I would't buy it. =>lfI . .. 23. I only come if they invite me. => unless....... 24. He didn't revise all his lessons, he failed the exam. => If he..... ... 25. The park is over there, only 5 minutes' walk. => If you walk..... 26. In case it rain, we'll stay at home =>lf it ....

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