因式分解：（x2-1）2+6（1-x2）+9．
人气：318 ℃ 时间：2019-10-31 18:29:57
解答
（x2-1）2+6（1-x2）+9
=（x2-1）2-6（x2-1）+9
=（x2-1-3）2
=（x-2）2（x+2）2．
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