xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1
问题描述:
xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1
答
xy(x-y)²-x(y-x)²+xm(x-y)²
=xy(x-y)²-x(x-y)²+xm(x-y)²
=x(y-1+m)(x-y)²
=4(1-1-1)(4-1)²
=-4x1x9
=-36