30 |
A.1+a+b | B.
| C.1-a-b | D.
|
lg2 |
lg3 |
lg2+lg5 |
lg3 |
1 |
a+b |
30 |
1 |
2 |
lg3+1 |
lg3 |
1 |
2 |
|
1 | ||
|
A.
| B.-
| C.
| D.-
|
A. | B. | C. | D. |
1 |
4 |
1 |
4 |
A.1<a,1<b | B.1<a且0<b<1 |
C.1<b且0<a<1 | D.0<a<1且0<b<1 |
log23 |
log29 |
8 |
5 |
1 |
2 |
1-x |
1+x |
1 |
2012 |
1 |
2013 |
1 |
2012 |
1 |
2013 |
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