全集I=R,集合A={x x=-t2+2t,t∈R}B={y y=-x2+2x+1,x∈R}则GIA∩B=
问题描述:
全集I=R,集合A={x x=-t2+2t,t∈R}B={y y=-x2+2x+1,x∈R}则GIA∩B=
答
A={x|x=-(t-1)^2+1B={y|y=-(x-1)^2+2CIA={x|x>1}
CIA∩B={x|1