(x^4-y^4)÷(x²+y²)计算
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(x^4-y^4)÷(x²+y²)计算
(x^4-y^4)÷(x²+y²)计算
(x^4-y^4)÷(x²+y²)计算
x^2-y^2
连学渣级别的凑公式都不会的话。。
(x^4-y^4)÷(x²+y²)
=(x²+y²)(x²-y²)÷(x²+y²)
=x²-y²
X^2-Y^2