已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0}B={y|y=1/2x^2-x+5/2,0

已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0}B={y|y=1/2x^2-x+5/2,0
已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0}B={y|y=1/2x^2-x+5/2,0<=x<=3}若A交B为空集求事数a的取值范围
已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0},B={y|y=1/2x^2-x+5/2,0<=x<=3},若A交B为空集,求事数a的取值范围.

已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0}B={y|y=1/2x^2-x+5/2,0
A:y^2-(a^2+a+1)+a(a^2+1)>0
(y-a)[y-(a^2+1)]>0
B:y=1/2(x^2-2x+5)=1/2[(x-1)^2+4]
又 0