Cho đường tròn tâm O bán kính R, hai dây cung AB và CD, các tia BA và DC cắt nhau tại M nằm ngoài (O)

a) Biết AB=CD chứng minh MA=MC

b) Nếu AB>CD, hãy so sánh khoảng cách từ điểm M đến trung điểm của các dây AB, CD

B1)1 tế bào sinh dưỡng nguyên phân 3 lần liên tiếp đòi hỏi mt nội bào cung cấp nguyên liệu tương đương với 322NST đơn xđ bộ NST lưỡi bộ của loài? loài đấy là loài nào?

B2) ở lúa nước 2n=46 có 20 hợp tử nguyên phân liên tiếp như nhau đã đòi hỏi mt nội bào cung cấp nguyên liệu tương đương với 4320 NST đơn mới xđ số lần nguyên phân của mỗi hợp tử

Exercise 1. Put these sentences into the passive voice.

1. Should they help Jane with the sewing?
2. The mechanic is repairing Judy’s car.
3. Must we finish the test before ten?
4. They use a computer to do that job nowadays.
5. Employers must pay all travel expenses for this training course.
6. Did her story take them in?
7. The bank manager kept me for half an hour.
8. Has he spelt this word wrongly?
9. All his friends will see him off at the airport.
10. They were cleaning the floor when I arrived.
11. They are digging the hole on the wrong side of the road.
12. They stole your money.

13. Has anyone ever asked you for your opinion?

Exercise 1. Put these sentences into the passive voice.

1. Should they help Jane with the sewing?
2. The mechanic is repairing Judy’s car.
3. Must we finish the test before ten?
4. They use a computer to do that job nowadays.
5. Employers must pay all travel expenses for this training course.
6. Did her story take them in?
7. The bank manager kept me for half an hour.
8. Has he spelt this word wrongly?
9. All his friends will see him off at the airport.
10. They were cleaning the floor when I arrived.
11. They are digging the hole on the wrong side of the road.
12. They stole your money.

13. Has anyone ever asked you for your opinion?

III. Đổi sang câu bị động

1. I clean the floor every day.

2. He saw a lion at the circus last week.

3. Sam and Nina told me this story.

4. I opened the door.

5. Your children ate this cake.

6. I have finished the report.

7. They had looked after this child when I came.

8. My father made this decision.

9. No one can do it.

10. Someone must send this report.

giúp tôi với bài ở dưới ạ

giúp tớ bài này vs ở dưới ạ