x^2+9x/x^2+3x+x^2-9/x^2+6x+9

分类: 作业答案 • 2022-01-02 13:29:04

问题描述：

答

=x(x+9)/x(x+3)+(x+3)(x-3)/(x+3)²
=(x+9)/(x+3)+(x-3)/(x+3)
=(x+9+x-3)/(x+3)
=2(x+3)/(x+3)
=2