Tìm x

a)(2x-1)^3-(2x-1)^3=-8

Tìm x

(2x-1)^3+3(2x+3)^2=26

Cho tứ giác ABCD có góc C- góc D=góc B- góc C=góc A-góc B . c/m ABCD là hình thang

Cho tứ giác ABCD có góc C- góc D=góc B- góc C=góc A-góc B . c/m ABCD là hình thang

Cho tứ giác ABCD có góc C-góc D=góc B-góc C=góc A-góc B.c/m ABCD là hình thang

Rút gọn các phân số sau

a)  ( − 7 ) .3 + 4. ( − 6 ) ( − 5 ) .3 + 2.3

b)  ( − 17 ) .13 + 17.2 11.2 − 11.19

She didn’t enjoy her first year at college because she failed to _____ her new friends.

A. come in for

B. look down on

C. go down with

D. get on with

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

 She didn’t understand the benefits of volunteering until she joined this club.

A. Not until she joined this club did she understand the benefits of volunteering.

B. It was not until she joined this club did she understand the benefits of volunteering.

C. Not until did she join this club, she understood the benefits of volunteering.

D. Not until she joined this club that she understood the benefits of volunteering.