1. a
2. c
5. b
6. b
7. c
8. c
9. b
12. b
13. a
15. d
16. a
17. c
18. a
19. d
20. c
21. d
22. d
23. b
9. If They had invited yesterday,I will be is a good day tomorrow
10. We will go swimming if it is a good day tomorrow
11. If the weather were nice last day, I could go for a walk
12. My dog always barks if he hears anything unusual
13. If he don't come soon , I’m not going to wait
14. If the phone rings can you answer it?
8. She has been watering the trees and flowers for an hour.
9. The man suggested going out tonight.
10. Mai advised Nam not to smoke if she were him.
Bạn tham khảo bài viết hay nhé: https://vndoc.com/phan-tich-bai-tho-bep-lua-cua-nha-tho-bang-viet-87359
a. x2 - 3x + 2 = 0
(x - 1)(x-2) = 0
Xét: x - 1 = 0 => x = 1
Xét: x - 2 = 0 => x = 2
b. y = (m2 - 4)x + m
y' = -3x + 1
Để y // y' thì:
Bạn tham khảo bài: https://vndoc.com/chuyen-de-4-giai-bai-toan-bang-cach-lap-phuong-trinh-he-phuong-trinh-193918
Bạn tham khảo bài: https://vndoc.com/mau-sac-cac-vat-duoi-anh-sang-trang-va-duoi-anh-sang-mau-184160