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thinhphuc
2 năm trước
Rút gọn các biểu thức sau Giúp mình với ạ $(a+b+c)^{2}$ + $(a+b-c)^{2}$ - 2.($a+b)^{2}$ ($a+b+c)^{2}$ + $(a-b+c)^{2}$ + $(a+b-c)^{2}$ + $(b+c-a)^{2}$
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I. Change the following sentences into passive voice 1. Mary types letters in the office. 2. His father will help you tomorrow. 3. Science and technology have changed human life. 4. Peter broke this bottle. 5. They are learning English in the room. 6. Nothing can change my mind. 7. No one had told me about it. 8. I buy 2 newspapers and 1 magazine everyday. 9. My students will bring the children home. 10. We should keep the room tidy. 11. She gave us more information. 12. The chief engineer was instructing all the workers of the plan. 13. We plant many flowers in the garden. 14. Somebody has taken some of my books away. 15. They will hold the meeting before May Day.  The meeting will be held before May Day. 16. They have to repair the engine of the car. 17. The boys broke the window and took away some pictures. 18. People spend a lot of money on advertising every day. 19. Teacher is going to tell a story. 20. Mary is cutting a cake with a sharp knife. 21. The children looked at the woman with a red hat. 22. They have provided the victims with food and clothing. 23. People speak English in almost every corner of the world. 24. The children drink 30 bottles of milk every month. 25. After class, one of the students always erases the chalk board.

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