Question

[Đông joker]

thu gọn biểu thức sau:

1) 7x-192+6x

2)-ab-ab

3)(a+b)x(a+b)

4)(a+b)x(a-b)

5)(a-b)x(a-b)

Answer 1

[Hằng jackson]

1) =x(7+6)-192

=13x-192

2)=-2ab

3)=2a+2b

4)ko bt, mk ko giai ra

5)=2a-2b