分式计算x²+9x/x²+3x+x²-9/x²+6x+9

来源：学生学帮网编辑：学帮网时间：2024/06/28 15:41:40

原式=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)
=(2x+6)/(x+3)
=2(x+3)/(x+3)
=2