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Đáp án+Giải thích các bước giải:

`c)` `-3x(x^2-7x+10)`

`=-3x^3-(-21x^2))+(-30x)`

`=-3x^3+21x^2-30x`

`d)` `(5x+2)(4x-1)`

`=20x^2-5x+8x-2`

`=20x^2+(8x-5x)-2`

`=20x^2+3x-2`

`e)` `(-3x+4)(2x-5)-7(x-3)`

`=-6x^2+15x+8x-20-7x+21`

`=-6x^2+23x-20-7x+21`

`=-6x^2+(23x-7x)+(21-20)`

`=-6x^2+16x+1`

`g)` `(3y-5)(y^2-4y+2)`

`=3y.y^2+3y.(-4y)+3y.2+(-5).y^2+(-5).(-4y)+(-5).2`

`=3y^3-12y^2+6y-5y^2+20y-10`

`=3y^3-17y^2+26y-10`