12/x^2-9+2/3-x 分式计算_数学解答

12/x^2-9+2/3-x 分式计算

人气：235 ℃　时间：2020-04-30 06:45:13

解答

原式=12/(x+3)(x-3)-2(x+3)/(x+3)(x-3)
=(12-2x-6)/(x+3)(x-3)
=-2(x-3)/(x+3)(x-3)
=-2/(x+3)