问题 选择题
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}
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.

单项选择题
单项选择题