(x+y) (x-y) (x²+y²) (x⁴+y⁴)等于?
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(x+y) (x-y) (x²+y²) (x⁴+y⁴)等于?
(x+y) (x-y) (x²+y²) (x⁴+y⁴)等于?
(x+y) (x-y) (x²+y²) (x⁴+y⁴)等于?
(x+y) (x-y) (x²+y²) (x⁴+y⁴)
=(x²-y²)(x²+y²) (x⁴+y⁴)
=(x⁴-y⁴)(x⁴+y⁴)
=x^8-y^8
x^8表示x的8次方
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