题目内容
设集合U={1,3a+5,a2+1},A={1,,a+1},且CUA={5},则a=________.
设集合U={1,3a+5,a2+1},A={1,a+1}且CUA={5},则a=________.
设集合U={1,3a+5,a2+1},A={1,a+1},且UA={5},则a= .