2个回答
展开全部
括号标号。我看不懂。我是这样理解的
(2-x)/(x-1)÷(x+1-3)/(x-1)
原式=(2-x)/(x-1)÷(x-2)/(x-1)
=-(x-2)/(x-1)×(x-1)/(x-2)
=-1
(2-x)/(x-1)÷(x+1-3)/(x-1)
原式=(2-x)/(x-1)÷(x-2)/(x-1)
=-(x-2)/(x-1)×(x-1)/(x-2)
=-1
追问
再次请求
追答
解:原式=(2-x)/(x-1)÷【(x+1)(x-1)/(x-1)-3/(x-1)】
=(2-x)/(x-1)÷(x^2-1-3)/(x-1)
=(2-x)/(x-1)×(x-1)/【(x+2)(x-2)】
=-1/x+2
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询