作业帮(x^2-y^2)^2-18(x^2-y^2)+72因式分解
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(x^2-y^2)^2-18(x^2-y^2)+72因式分解
(x^2-y^2)^2-18(x^2-y^2)+72因式分解
(x^2-y^2)^2-18(x^2-y^2)+72因式分解
(x^2-y^2)^2-18(x^2-y^2)+72
=（x²－y²－12）（x²－y²－6）
十字相乘
x²－y² ﹣12
×
x²－y² ﹣6
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