D

A

D

C

B

I don't know how to play the game.

This department is to the left of the post office.

Phương án 1, nhưng phải sửa là with a ball under the table.

I don't know how to play the game.

This department is to the left of the post office.

bài ảo

dài quá bạn ơi  môt 2 câu thôi

bn đang thi à

Câu 4: 

1) Ta có: \(A=99\cdot101\)

\(\Leftrightarrow A=\left(100-1\right)\left(100+1\right)\)

\(\Leftrightarrow A=100^2-1\)

mà \(B=100^2\)

nên A<B

a: Ta có: \(a\left(b-c\right)-b\left(a+c\right)+c\left(a-b\right)\)

\(=ab-ac-ab-bc+ac-bc\)

=-2bc