计算 (x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
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计算(x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)计算(x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)计算(x^8+y^8)(x^4+y^4)(x
计算 (x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
计算 (x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
计算 (x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
(x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
=(x^8+y^8)(x^4+y^4)(x^2+y^2)(x^2-y^2)
=(x^8+y^8)(x^4+y^4)(x^4-y^4)
=(x^8+y^8)(x^8-y^8)
=x^16-y^16
x^16-y^16
从后往前算..
先做后两项
（x+y)(x-y)=x^2-y^2
依次向前做
最后得x^16-y^16
从后往前算！
(x^8+y^8)(x^4+y^4)(x^2+y^2)(x+y)(x-y)
=(x^8+y^8)(x^4+y^4)(x^2+y^2)(x^2-y^2)
=(x^8+y^8)(x^4+y^4)(x^4-y^4)
=(x^8+y^8)(x^8-y^8)
=x^16-y^16
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