user-avatar
huyentranht013
2 năm trước
Chứng minh a x^2-6x+15>0 với mọi x b x^2+5x+7>0 với mọi x c 2x^2 +6x +14>0 với mọi giá trị của x d 4x^2- 3x + 2 > 0 với mọi giá trị của x
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1.His car / wash / every day. - ....................................................................................................... 2.Computers / use / so often / in schools / today. - ................................................................................................................................... 3.Stamps / sell / the post office. - ................................................................................................... 4.Garbage bins / empty / every day. - ............................................................................................. 5.Rice / export / to many countries / world.- ................................................................................. 6.Many street accidents / cause / bad weather. - ............................................................................ 7.Butter / cheese / make / from milk. - ............................................................................................ 8.Classroom / sweep / students / every day.- .................................................................................. 9.Paper / make / from / wood. - ..................................................................................................... 10.Oil / import / from / other Asiean countries.- ...........................................................................

EX. 4 Choose the best answer to fill in the blank The tiny gymnastic star Claudia Fragapane is (0)…A...1.38 metres tall. But this (1)…… 16 year-old has aimed high! In 2014, she (2)………….the first English woman in 84 years to (3)………….four gold medals at the Commonweath Games. This wa just her second competition at senior level, so her (4)………….are amazing. (5)……………the Commonweath Games, Claudia’s parents had a surprise party for her, and around 300 people (6)………………..to celebrate her success. There was a big cake, but Claudia didn’t have (7)…………..time to eat any because she was busy taling to everyone! She is now preparing for future gymnastics events, (8)…………………….wants to help children in her local gym as well. She still trains in Bristol, the city in the west of England (9)…………………..she lives. She has two (10)…………., Helen Potter and Rory Weavers, who are both very proud of her.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team