分解因式x的四次方-7x的平方+9
人气：100 ℃ 时间：2020-03-27 05:42:22
解答
x^4-7x^2+9
=x^4-6x^2+9-x^2
=(x^2-3)^2-x^2
=(x^2-x-3)(x^2+x-3)
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