已知*S={1,2},*T={x|(x-1)(x-3)=0},那麼S∪T=A.Æ ... 問題詳情:已知*S={1,2},*T={x|(x-1)(x-3)=0},那麼S∪T=A.Æ B.{1}C.{1,2} D.{1,2,3}【回答】D知識點:*與函式的概念題...