She has a bad earache because she wore her earphones everywhere in bed, on the couch, in the bathtub.

I think some parents should allow children to have a little more responsibilities for out-door activities.

1. People are living longer so there are more elderly people.

1. People are living longer so there are more elderly people.

A.understand B.engineer C.interesting D.vietnamese

A.typhoon B.volunteer C.device D.climatic

Bạn tự tìm trong từ điển Anh-Việt đi nhé! Cả nghìn từ luôn

a) A = (2x + 1)² + (3x - 1)² - 2(3x - 1)(2x + 1)

= (2x + 1 - 3x + 1)² = (2 - x)² = (x - 2)²

b) A = (x - 2)² = (1002 - 2)² = 1000² = 1000000

vậy thì lần sau đừng hỏi nữa!