(x-2a)(x-a²-1)≤0∵a²+1≥2a∴2a≤x≤a²+1即A:{x| 2a≤x≤a²+1}x²-3(a+1)x+2(3a+1)≤0{x-(3a+1)}(x-2)≤0解集为B∵ A包含于B又:A:{x| 2a≤x≤a²+1},其中a²+1≥1∴B:{x| 3a+1≤x≤2}∵A包含于B∴3a+1≤2a,并且a²+1≤2∴a≤-1,并且a²≤1∴a=-1