x-1分之2-x除以（x+1-3除以x-1)_数学解答

x-1分之2-x除以（x+1-3除以x-1)

人气：450 ℃　时间：2019-08-20 20:59:44

解答

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