(x²-9)(9-x²)请写出过程,
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/16 01:37:43
(x²-9)(9-x²)请写出过程,(x²-9)(9-x²)请写出过程,(x²-9)(9-x²)请写出过程,(x²-9)(9-x&
(x²-9)(9-x²)请写出过程,
(x²-9)(9-x²)请写出过程,
(x²-9)(9-x²)请写出过程,
(x²-9)(9-x²)
=9x²-x的4次方-81+9x²
=-x的4次方+18x²-81
(x²-9)(9-x²)=-(x²-9)(x²-9)=-(x²-9)²
原式=-(x²-9)²=-x^4+18x²-81
如果是因式分解，原式=-(x+3)²(x-3)²