(x^n+y^n)(x^n-y^n)-(x^n+y^n)² 计算.

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(x^n+y^n)(x^n-y^n)-(x^n+y^n)²计算.(x^n+y^n)(x^n-y^n)-(x^n+y^n)²计算.(x^n+y^n)(x^n-y^n)-(x^n+y^

(x^n+y^n)(x^n-y^n)-(x^n+y^n)² 计算.
(x^n+y^n)(x^n-y^n)-(x^n+y^n)² 计算.

(x^n+y^n)(x^n-y^n)-(x^n+y^n)² 计算.
(xⁿ+yⁿ)(xⁿ-yⁿ)-(xⁿ+yⁿ)²
=(xⁿ+yⁿ)[(xⁿ-yⁿ)-(xⁿ+yⁿ)] (提取xⁿ+yⁿ)
=(xⁿ+yⁿ)(-2yⁿ)
=-2yⁿ(xⁿ+yⁿ)

=(x^n)^2-(y^n)^2-(x^n+y^n)^2
= ---2x^n*y^n
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