令y=|x+2|+|2x-1| 对其进行分类讨论 当x>=1/2 y=3x+1当-2<=x<=1/2 y=-x+3当-2画出图像因为集合B={x|-1<=x<=3}，A交B不是空集当-1<=x<=3 A=[4,10]所以a<10
