摘要：集合U={(x.y)|x∈{1,2},y∈{1,2}} , A={(x.y)|x∈N*,y∈N*,x+y=3}.求CUA. 解:CUA={}.

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设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A ∩(C_UB)的充要条件是

A.m>-1且n<5 B.m<-1且n<5

C.m>-1且n>5 D.m<-1且n>5

设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A∩(C_UB)的充要条件是

设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A∩(CUB)的充要条件是