请计算出：[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1_数学解答

请计算出：[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1

人气：195 ℃　时间：2020-04-03 22:25:22

解答

x/(x-1) - 3/(x-1)(x+2) -1
=[x(x+2)-3-(x-1)(x+2)]/(x-1)(x+2)
=(x²+2x-3-x²-x+2)/(x-1)(x+2)
=(x-1)/(x-1)(x+2)
=1/(x+2)