Question

已知集合A={y/y=log3x,x>1},B={y/y=3x,x>0},则A∩B是多少

Answer 1

A={y|y=log3 x,x>1}={y|y>0}

B={y|y=3x,x>0}={y|y>0}

所以A∩B={y|y>0}