设全集I={(x,y)|x,y∈R},集合M={(x,y)|y-3x-2=1},N=(x,y)|y≠x+1.那么.M∪.N等于()A.12B.{(2,3)}C.(2,3)D.{(x,y)|y=x+1}

题目简介

设全集I={(x,y)|x,y∈R},集合M={(x,y)|y-3x-2=1},N=(x,y)|y≠x+1.那么.M∪.N等于()A.12B.{(2,3)}C.(2,3)D.{(x,y)|y=x+1}

题目详情

设全集I={(x,y)|x,y∈R},集合M={(x,y)|
y-3
x-2
=1},N=(x,y)|y≠x+1.那么
.
M
.
N
等于(  )
A.
1
2
B.{(2,3)}C.(2,3)D.{(x,y)|y=x+1}
题型:单选题难度:中档来源:不详

答案

∵M={(x,y)|y=x+1或(x,y)≠(2,3)},
.
M
={(x,y)|y≠x+1或(x,y)=(2,3)}

又∵
.
N
={(x,y)|y=x+1}

.
M
.
N
={(2,3)}

故答案选B.

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