计算题 xy【y^2+x^2】-y^2【xy+2x】-3xy

分类: 作业答案 • 2022-02-14 20:02:10

问题描述：

答

xy【y^2+x^2】-y^2【xy+2x】-3xy
=xy【y^2+x^2】-xy^2【y+2】-3xy
=xy[x^2+y^2-y^2-2y-3]
=xy(x^2-2y-3)

答

xy【y^2+x^2】-y^2【xy+2x】-3xy
=xy^3+yx^3-xy^3-2xy^2-3xy
=x^3y-2xy^2-3xy
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