x²+(-3a+2)x+(2a-3)(a+1)<0
1 -(2a-3)
×
1 -(a+1)
[x-(2a-3)][x-(a+1)]<0
然后比较2a-3和a+1大小即可
X²-(3a-2)X+2a²-a-3<0
解:∵2a²-a-3=(2a-3)(a+1)
∴X²-(3a-2)X+2a²-a-3
=[x-(2a-3)][x-(a+1)]<0
①当2a-3>a+1,即a>4时
X²-(3a-2)X+2a²-a-3<0的解为:(a+1,2a-3)
②当2a-3>a+1,即a=4时
x²<0 无解
X²-(3a-2)X+2a²-a-3<0无解
③当2a-3 X²-(3a-2)X+2a²-a-3<0的解为:(2a-3,a+1)