Question

集合A=｛y丨y=根号x²-1｝,B=｛x丨y=根号x²-1｝则下列结论A=B A含于B B含于A

Answer 1

A={y|y≥0}

B=【x|x≤-1或者x≥1}

∴A∩B={x|x≥}