问题
选择题
设全集I={(x,y)|x,y∈R},集合M={(x,y)|
|
答案
∵M={(x,y)|y=x+1或(x,y)≠(2,3)},
∴
={(x,y)|y≠x+1或(x,y)=(2,3)},. M
又∵
={(x,y)|y=x+1}.. N
∴
∪. M
={(2,3)}.. N
故答案选B.
设全集I={(x,y)|x,y∈R},集合M={(x,y)|
|
∵M={(x,y)|y=x+1或(x,y)≠(2,3)},
∴
={(x,y)|y≠x+1或(x,y)=(2,3)},. M
又∵
={(x,y)|y=x+1}.. N
∴
∪. M
={(2,3)}.. N
故答案选B.