Question

Bài 1 Thực hiện phép nhân

\(a, (2x-1)(x^2+3x)-2x^2(x+3)\)

Answer 1

\(=\left(2x^2-x-2x^2\right)\left(x+3\right)=-x\left(x+3\right)\)

Answer 2

`(2x-1)(x^2+3x)-2x^2(x+3)`

`=2x^3+6x^2-x^2-3x-2x^3-6x^2`

`=-x^2-3x`

Answer 3

\(\left(2x-1\right)\left(x^2+3x\right)-2x^2\left(x+3\right)\)

\(=2x^3+6x^2-x^2-3x-2x^3-6x^2\)

\(=-x^2-3x=-x\left(x+3\right)\)

ũa đúng mà e:v