设集合A={X/X大于1｝,B={X/X小于等于-1｝,求AUB

设集合A={X/X大于1｝,B={X/X小于等于-1｝,求AUB
设集合A={X/X大于1｝,B={X/X小于等于-1｝,求AUB

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

AUB＝{X/X∈R}

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

A={x|x>1}，B={x|x≤－1}
则：AUB={x|x≤－1或x>1}