设全集U=｛2,4,1-a｝,A=｛2,a²-a+2｝,若CuA=｛-1｝,求实数a的值?

设全集U=R,集合A={xl-2 设全集U=R,A={x|2 设全集U=R,集合A={x|-2 设全集U=R,A={x|-2 设全集U=R,A{x|2 设全集u=R集合A 设全集U={1,2,3,4,5},A={2,3,4},则C∪A= 设全集U=｛1,2,3,4,5｝,其子集A=｛5,1｝则A∩CUA 设全集U=R,集合A={x｜｜2x-1｜+｜x-2｜ 设全集U=R,集合A={x｜｜2x-1｜+｜x-2｜ 设全集U={x|-2≤x≤4},集合A={X|0 （1）设全集U=R,集合A=｛x｜2 设全集U=R,集合A={x|2x-1 设全集U=R 集合A=｛x/-4 设全集U=R,集合A={-4 设全集U=R,集合A={-4 设全集U=R,集合A={X|-1 设全集U=R,集合A={x|-1