若集合A={x丨丨x-1丨0},集合B={(x丨x-7)/(x+1)
问题描述:
若集合A={x丨丨x-1丨0},集合B={(x丨x-7)/(x+1)
答
先求出B中x的范围
(x-7)/(x+1) = 1-8/(x+1)