9m2 84dm2

Câu 1: Chứng tỏ rằng đa thức F(X)=X² -X +1 không có nghiệm trên tập hợp số thực R

1We bought this picture a long time ago. We (have) it for ages.
2Sandra finds her mobile phone very useful. She (use) it all the time.
3There’s a new road to the motorway. They (open) it yesterday.
4We decided not to go out because it (rain) quite hard.
5Vicky doesn’t know where her watch is. She (lose) it.
6We had no car at that time. We (sell) our old one.
7I bought a new jacket last week but I (not wear) it yet.
8Claire is on skiing holiday. She (enjoy) it, she says on the postcard.
9The color of this paint is absolutely awful. I (hate) it.
10Henry is annoyed. He (wait) a long time for Claire.