f'(x)=4x-3-
| 1 |
| x |
| (4x+1)(x-1) |
| x |
∴当x∈(
| 1 |
| e |
即f(x)在(
| 1 |
| e |
∵f(1)=-1<0,f(
| 1 |
| e |
| (e-1)(e-2) |
| e2 |
∴函数f(x)在区间(
| 1 |
| e |
( II)∵a≠0f′(x)=
| (2ax+1)(x-1) |
| x |
∴f'(x)=0的根是1 , -
| 1 |
| 2a |
当-
| 1 |
| 2a |
∴函数f(x)在(1,e)上单调,
故a>0 或a≤-
| 1 |
| 2 |
当-
| 1 |
| 2a |
| 1 |
| 2a |
| 1 |
| 2e |
综上a≤-
| 1 |
| 2 |
| 1 |
| 2e |
| 1 |
| e |
| 1 |
| x |
| (4x+1)(x-1) |
| x |
| 1 |
| e |
| 1 |
| e |
| 1 |
| e |
| (e-1)(e-2) |
| e2 |
| 1 |
| e |
| (2ax+1)(x-1) |
| x |
| 1 |
| 2a |
| 1 |
| 2a |
| 1 |
| 2 |
| 1 |
| 2a |
| 1 |
| 2a |
| 1 |
| 2e |
| 1 |
| 2 |
| 1 |
| 2e |