x2-4分之2x-x-2分之1_数学解答

x2-4分之2x-x-2分之1

人气：369 ℃　时间：2019-12-08 07:26:13

解答

=2x/(x+2)(x-2)-(x+2)/(x+2)(x-2)
=[2x-(x+2)]/(x+2)(x-2)
=(2-x)/(x+2)(x-2)
=-1/(x+2)