①集合A={y/y=x*x+2x-3,x属于R},B={y/y=-x*x+2x+15,x属于R},求A...答:1) A: y=(x+1)^2-4>=-4, 即A={y|y>=-4} B: y=-(x-1)^2+16<=16, 即B={y|y<=16} AUB=R 2) A: y=(x+1)^2-4, x为N,即x=0, 1,2,3,...即y=-3, 0, 5, 12,21, ...n^2-4,,...B: y=-(x-1)^2+16, x为N,即y=15, 16, 15, 12, 7,...