xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1

xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1
xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1

xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1
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

原式=xy(x-y)²-xm(x-y)²-x(y-x)²
=-x(y-x)²
当x=4,y=1,m=-1时，
原式=-4*(1-4)²
=-36

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(x-y)²(y-x+m)
当x=4,y=1,m=-1时
原式=4(4-1)²(1-1-1)
=4×9×(-1)
=-36