Question

设全集U=R,集合A={x∈R|-1≤x<5或x=6},B={x∈R|2≤x<5};求CuA,CuB及CuB

Answer 1

U=R, A={x∈R|-1≤x<5 or x=6},
B={x∈R|2≤x<5};

CuA =R-A
=R- {x∈R|-1≤x<5 or x=6}
={x| x<-1 or x≥5 and x≠6, x∈R }

CuB =R-B
={x| x>2 or x≤5, x∈R }