Viết câu tương đương:

1. I won't go to school if I don't fell better. ➜.....................................................................

2. Tony will talk to you if you question him. ➜...................................................................

3. If you don't put on your overcoat, you'll be cold. ➜..............................................................

4. You will fail the exam if you don't work hard. ➜...........................................................

5. You'll get a cold if you don't keep your feet dry. ➜...........................................................

6. If I don't leave now, I'll miss my flight. ➜.......................................................................

7. If you aren't going to the party, I won't go. ➜..................................................................

8. I can't send you a postcard if you don't give me your address. ➜............................................................................

9. If I won a big prize in a lottery, I'd build a school for the poor. ➜...................................................................

10. I'll call the police if you don't leave me alone. ➜........................................................................................

Dựa vào tóm tắt giải:

cho biết: f=12cm

d=8cm

a) Dựng ảnh

b)Tính d'.

Dựa vào tóm tắt để giải bài:

Tóm tắt: f=12

AB=\(\frac{1}{2}\)A'B'

d=20

a) Thấu kính?

Dựng ảnh.

b) Tính d'.

Viết câu tương đương:

1. She doesn't like thí place. ➜I wish ................................................................

2.These student talked too much in class ➜I wish ..................................................

3. I can't play basketball. ➜I wish ..............................................................

4. I miss the cartoon o TV ➜I wish.........................................................

5. Lan cannot meet her friend. ➜She wish.........................................................

6. Phong cannot win the championship. ➜He wish....................................................

7.Their team don't play very well ➜They wish......................................................

8. Lien never góe on a camping trip ➜She wish..............................................

9. She doesn't get good marks ➜She wish................................................

10. Her mother doesn't buy her new clothes for Tet. ➜She wish....................................................

11. He got a bad mark yesterday ➜He wish...................................................

12. It's a shame I don't have a key. ➜I wish...............................................................

13.Ann isn't here and I need to see her ➜I wish....................................................

14. It's pity the weather isn't bette today ➜I wish.......................................................

15. They don't know how to speak Chinese ➜They wish.................................................

Cho phương trình x²-2x-3m²=0, với m là tham số.

a) Giải phương trình khi m=1.

b)tìm tất cả các giá trị của m để phương trình có hai nghiệm x₁,x₂ khác 0 và thỏa điều kiện \(\frac{x_1}{x_2}-\frac{x_2}{x_1}=\frac{8}{3}\)