Đáp án:
`d)`
`16x^2(x-y)-18y(y-x)+5(x-y)^2`
`=16x^2(x-y)+18y(x-y)+5(x-y)^2`
`=(x-y)[16x^2+18y+5(x-y)]`
`=(x-y)(16x^2+18y+5x-5y)`
`=(x-y)(16x^2+5x+13y)`
`e)`
`14x^3y^2-21xy^3+28x^2y^2`
`=7xy^{2}.2x^2-7xy^{2}.3y+7xy^{2}.4x`
`=7xy^2(2x^2-3y+4x)`
`g)`
`3.x^{m+4}+5.x^{m+3}+x^{m+2}` `(m∈NN)`
`=3.x^{m}.x^4+5.x^{m}.x^3+x^{m}.x^2`
`=x^{m}.3x^4+x^{m}.5x^3+x^{m}.x^2`
`=x^{m}.(3x^4+5x^3+x^2)`