设集合A={X/X大于1},B={X/X小于等于-1},求AUB

问题描述:

设集合A={X/X大于1},B={X/X小于等于-1},求AUB

A = {x | x > 1}
B = {x | x ≤ -1}
所以A∪B = {x | x > 1或者x ≤ -1} = R