(x-1)(x-3)(x+1)(x+3)-20 因式分解

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(x-1)(x-3)(x+1)(x+3)-20 因式分解
要用拆项添项法

(x-1)(x-3)(x+1)(x+3)-20
=(x^2-1)(x^2-9)-20
=x^4-10x^2-11
=(x^2-11)(x^2+1)
=(x-√11)(x+√11)(x^2+1)

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