Question

设全集U=R,集合A={x∈R|2<x<9},集合B={x∈R|-1≤x≤6}求Cu(A∩B)

帮忙做一下

Answer 1

A∩B={x∈R|2<x≤6}
Cu(A∩B)={x∈R|x≤2,或，x>6}