问题标题:
计算(x-y)(x^2-y^2)(x+y)(利用乘法公式展开)
问题描述:
计算(x-y)(x^2-y^2)(x+y)(利用乘法公式展开)
李白男回答:
由于x^2-y^2=(x-y)(x+y)(平方差)
则(x-y)(x^2-y^2)(x+y)=(x-y)(x-y)(x+y)(x+y)=[(x-y)^2][(x+y)^2]
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