Giải pt sau: a. 12(sinx-cosx)-sinx=12 b. cosx-sinx+2sinxcosx=0

Giúp em 1 câu trắc nghiệm vs ạ giải cách làm ra giúp e cảm mơn

V- Change these sentences into Passive voice 1. Have you sent the Christmas cards to your family? 2. The committee appointed Alice secretary for the meeting. 3. He hides the broken cup in the drawer. 4. They keep this room tidy all the time. 5. They all voted the party a great success. 6. The children looked at the woman with a red hat. 7. They have provided the victims with food and clothing. 8. People speak English in almost every corner of the world. 9. You mustn't use this machine after 5:30 p.m. 10. After class, one of the students always erases the chalk board. 11. When will you do the work? 12. How are you going to deal with this problem? 12. How do you spend this amount of money? 14. I wonder whether the board of directors will choose Susan or Jane for the position. 15. How did the police find the lost man?

Hòa tan hoàn toàn m gam hh X gồm FeO, Fe2O3, Fe3O4 bằng 700 gam dd HCl 14,6% thu được dung . dịch Y. Để trung hòa lượng axit dư trong Y cần dùng 280 ml dung dịch NaOH 2M. Mặt khác để khử hoàn toàn m gam X thành kim loại cần tối thiểu V lít (đktc) khí H2. Tìm giá trị của V

giúp em với nhớ trình bày cách giải nha

Giúp mình với mình đang cần gấp

giải thích chi tiết có hay nhất ạ

IV-Chuyển các câu có 2 tân ngữ sau sang câu bị động- 2 cách mỗi câu 1. They paid me a lot of money to do the job. 2. The teacher gave each of us two exercise books. 3. Someone will tell him that news. 4. They have sent enough money to those poor boys. 5. They have given the women in most countries in the world the right to vote.

III. Chuyển các câu hỏi bắt đầu bằng từ hỏi “H/WH” sau sang câu bị động 1. Why didn’t they help him? 2. How many games has the team played? 3. Where do people speak English? 4. Who are they keeping in the kitchen? 5. How can they open this safe? 6. What books are people reading this year? 7. How did the police find the lost man? 8. Who look after the children for you? 9. How long have they waited for the doctor? 10. What time can the boys hand in their papers? 11. Who lend you this book? 12. How many marks does the teacher give you?

II. Chuyển các câu hỏi dạng đảo Có/Không sang câu bị động 1. Do they teach English here? 2. Will you invite her to your wedding party? 3. Has Tom finished the work? 4. Did the teacher give some exercises? 5. Have they changed the window of the laboratory? 6. Is she going to write a poem? 7. Is she making big cakes for the party? 8. Are the police making inquires about the thief? 9. Must we finish the test before ten? 10. Will buses bring the children home? 11. Have you finished your homework?