6(x-y)的三次方+12(x-y)的平方-3(y-x)的平方

问题描述:

6(x-y)的三次方+12(x-y)的平方-3(y-x)的平方

6(x-y)的三次方+12(x-y)的平方-3(y-x)的平方
=6(x-y)³+12(x-y)²-3(x-y)²
=6(x-y)³+9(x-y)²
=3(x-y)²(2x-2y+3)