作业帮计算(x-y)(x^2-y^2)(x+y)（利用乘法公式展开）
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计算(x-y)(x^2-y^2)(x+y)（利用乘法公式展开）
计算(x-y)(x^2-y^2)(x+y)（利用乘法公式展开）
计算(x-y)(x^2-y^2)(x+y)（利用乘法公式展开）
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]
(x-y)(x²-y²)(x+y)
=(x-y)(x+y)(x²-y²)
=(x²-y²)(x²-y²)
=(x²-y²)²
=x^4-2x²y²+y^4
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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