原式=-x2•x3•8y3-4x2y2•x3•y
=-8x5y3-4x5y3
=-12x5y3．
计算：（-x）2•x3•（-2y）3+（2xy）2•（-x）3•y．
计算：（-x）2•x3•（-2y）3+（2xy）2•（-x）3•y．
数学人气：308 ℃时间：2020-04-30 23:39:37
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