设集合U={(x,y)|y=3x-1},A={(x,y)|y−2x−1=3},则∁UA=_.
问题描述:
设集合U={(x,y)|y=3x-1},A={(x,y)|
=3},则∁UA=______. y−2 x−1
答
∵集合U={(x,y)|y=3x-1},A={(x,y)|
=3}={(x y)|y=3x-1,且x≠1},y−2 x−1
∴∁UA={(1,2)},
故答案为 {(1,2)}.