Question

已知集合A={xl－1≤x≤2}，B={x丨x<1}，则A∩(CRB)=

Answer 1

CR B=x大于等于1

A交(CRB)=1小于等于x小于等于2

Answer 2

CRB=R-B={x>=1}
故A∩(CRB)={xl1≤x≤2}

Answer 3

={xl1≤x≤2}