问题
选择题
集合A={-1,0,1},B={y|y=3x,x∈A},则A∩B=( )
A.{0}
B.{1}
C.{0,1}
D.{-1,0,1}
答案
∵集合A={-1,0,1},B={y|y=3x,x∈A},
∵B={
,1,3}1 3
∴A∩B={1}.
故选B.
集合A={-1,0,1},B={y|y=3x,x∈A},则A∩B=( )
A.{0}
B.{1}
C.{0,1}
D.{-1,0,1}
∵集合A={-1,0,1},B={y|y=3x,x∈A},
∵B={
,1,3}1 3
∴A∩B={1}.
故选B.