Cho phương trình x2 - 6x + m = 0
a, Với giá trị nào của m thì phương trình có 2 nghiệm trái dấu
b, Tìm m để phương trình có 2 nghiệm x1,x2 thỏa mãn điều kiện x1 - 2x2 = m
- visit - play - watch - listen - elimb
- drive - swim - hang out - surf - read
1. she like_____with her best friend Kim about fashion.
2. the children enjoyed_____hipopotamus on TV.
3. they love_____the moutain, so they have prepared hiking shoes.
4. she will go_____in the pool near her house.
5. cars will be banned from_____in the town centre soon.
6. William enjoys_____tennis, but i don't.
7. you should return the book after_____it.
8. Hung spent the morning____to music.
9. i took friday off, and spent a long weekend______grandparents.
10. _____the internet is fun, but it wastes time.