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已知集合A={1,2,3,4},B={y|y=,xA},则AB=( )
A.{1,2,3,4} B.{1,2} C.{1,3} D.{2,4}
已知集合A={1,2,a-1},B={0,3,a2+1},若,则实数a的值为 ( )
A.±1 B.1 C.-1 D.0
A.8 B.9 C.18 D.24
A.0 B.±1 C.-1 D.1