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计算(x-y)(x^2-y^2)(x+y)(利用乘法公式展开)
人气:496 ℃ 时间:2020-03-18 08:11:45
解答
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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