Đáp án:
`a)y(x-1)`
`b)7xy²(2x²-3y+4x)`
`c)x^2016(x^2+1)(x^4+1)`
Giải thích các bước giải:
`a)xy-y`
`=x.y-y.1`
`=y(x-1)`
`b)14x³y²-21xy³+28x²y²`
`=7xy².2x²-7xy².3y+7xy².4x`
`=7xy²(2x²-3y+4x)`
`c)x^2016+x^2018+x^2020+x^2022`
`=x^2016 .1+x^2016 .x^2+x^2016 .x^4+x^2016 .x^6`
`=x^2016 .(1+x^2+x^4+x^6)`
`=x^2016 .[(x^2+1)+(x^6+x^4)]`
`=x^2016 .[(x^2+1)+x^4(x^2+1)]`
`=x^2016(x^2+1)(x^4+1)`