已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0},B={y|y^2-6y+8

已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0},B={y|y^2-6y+8
已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0},B={y|y^2-6y+8

已知集合A={y|y^2-(a^2+a+1)y+a(a^2+1)>0},B={y|y^2-6y+8
B={y|2≤y≤4}
A={y|ya^2+1}
依题意a>2或a^2+12或 -根号3