(x^2+9)^2-(x+3)^2(x-3)^2

分类: 作业答案 • 2021-12-19 23:11:30

问题描述：

答

(x^2+9)^2-(x+3)^2(x-3)^2
=(x^2+9)-(x^2-9)^2
=(x^2+9+x^2-9)(x^2+9-x^2+9)
=2x^2×18
=36x^2