(x²-9)(9-x²)请写出过程,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 00:12:50
![(x²-9)(9-x²)请写出过程,](/uploads/image/z/2540824-16-4.jpg?t=%28x%26%23178%3B-9%29%289-x%26%23178%3B%29%E8%AF%B7%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%2C)
(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