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xy(x-y)²-x(y-x)²+xm(x-y)²,其中x=4,y=1,m=-1
人气:429 ℃ 时间:2020-06-21 00:34:31
解答
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
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