设集合A={X/X大于1},B={X/X小于等于-1},求AUB
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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}