题目内容
| ∫ | 21 |
| 1 |
| x |
| 1 |
| x2 |
| 1 |
| x3 |
A.ln2+
| B.ln2-
| C.ln2+
| D.ln2+
|
∵
(
+
-
)dx
=(lnx-x-1+
x-2)|12
=ln2+
.
故选D.
| ∫ | 21 |
| 1 |
| x |
| 1 |
| x2 |
| 1 |
| x3 |
=(lnx-x-1+
| 1 |
| 2 |
=ln2+
| 1 |
| 8 |
故选D.
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相关题目
| ∫ | 2 1 |
| 1 |
| x |
| 1 |
| x2 |
| 1 |
| x3 |
A、ln2+
| ||
B、ln2-
| ||
C、ln2+
| ||
D、ln2+
|