Question

Answer 1

Bài `2.2`

`a, A=  3y^3 - 6y^2`

`= 3y^2 . y - 3y^2 . 2`

`= 3y^2(y-2)`

`b, B = 2x(x-3)-3(x-3)`

`=(2x-3)(x-3)`

`c, C = 3x^5 + 9x^3 -12x^2`

`= 3x^2 . x^3 + 3x^2 . 3x - 3x^2 . 4`

`= 3x^2 . (x^3+3x-4)`

`d, D=3(x-y)-5x(y-x)`

`= 3(x-y)+5x(x-y)`

`= (3+5x)(x-y)`

 

Answer 2

Bài `2.3`

`a, A=  x^2y^5+3x^3y^2`

`= x^2y^2 . y^3 + 3 . x^2 . x . y^2`

`= x^2y^2 . (y^3 + 3x)`

`b, B = 12x^7y^4 + 6x^4y^4z`

`= 6x^4y^4 . 2x^3 + 6x^4y^4 .z`

`= 6x^4y^4(2x^3+z)`

`c, C = 3x^4 + 6x^3 - 12x^2`

`= 3x^2 . x^2 +  3x^2 . 2x - 3x^2 . 4`

`= 3x^2 . (x^2 + 2x - 4)`

`d, D = 3x(2a+1)-5y(2a+1)`

`= (3x-5y)(2a+1)`