已知A={1,3,a},B={1,a2},且A∪B={1,3,a},求a.
已知集合A={x|x<1或x>5},B={x|a≤x≤b},且A∪B=R,A∩B={x|5<x≤6},
则2a-b= .
.设集合A={0,1,2,4,5,7},B={1,3,6,8,9},C={3,7,8}.则集合(A∩B)∪C= , (A∪C)∩(B∪C)= .
已知A={(x,y)|x+y=3},B={(x,y)|x-y=1},则A∩B= ( )
A.{2,1} B.{x=2,y=1}
C.{(2,1)} D.(2,1)
满足{0}∪B={0,2}的集合B的个数是 ( )
A.1 B.2
C.3 D.4
集合A={0,2,a},B={1,a2}.若A∪B={0,1,2,4,16},则a的值为 ( )
A.0 B.1
C.2 D.4