xy³-2x²y²+x³y怎么解?

问题描述:

xy³-2x²y²+x³y怎么解?

XY(Y2-2XY+X2)=XY(Y-X)2
xy乘(y-x)的平方

xy³-2x²y²+x³y
=xy(y²-2xy+x²)
=xy(x-y)²