1 |
2 |
1 |
2 |
1 |
200 |
1 |
20 |
1 |
200 |
1 |
2 |
x |
200 |
1 |
2x+1 |
1 |
200 |
199-2x |
200(2x+1) |
1 |
2 |
1 |
20 |
1 |
20 |
ln(2x+1) |
2x |
ln(2x+1) |
2x |
| ||
2x2 |
2x-(2x+1)ln(2x+1) |
2x2(2x+1) |
2 |
2x+1 |
ln41 |
40 |
ln41 |
40 |
1 |
20 |
ln41-2 |
40 |
2x |
4x+1 |
-k |
x |
A.(-∞,0) | B.(0,+∞) | C.(1,+∞) | D.(-∞,1) |
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