就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0

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就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0x

就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0
就一道十字相乘题
x²-3(a+1)x+2(3a+1)≤0

就一道十字相乘题x²-3(a+1)x+2(3a+1)≤0
x ^2-3(a+1)x+2(3a+1)<=0
(x-2)[x-(3a+1)]<=0
(1)3a+1>=2;即:a>=1/3
2=(2)3a+1<2;即:a<1/3
3a+1=

1 -(3a+1)
1 -2
即可以化简为(x-(3a+1)) (x-2)