sn |
(n+18)Sn+1 |
n(n+1) |
2 |
| ||
(n+18)?
|
n |
(n+18)(n+2) |
1 | ||
n+
|
1 |
32 |
1 |
32 |
A.1个 | B.2个 | C.3个 | D.4个 |
ax |
1+x2 |
1 |
2 |
1 |
2 |
1 |
2 |
x1+x2 |
2 |
A.f1(x)=x
| B.f2(x)=x2 | C.f3(x)=2x | D.f4(x)=log
|
5 |
2 |
7 |
2 |
A.f(
| B.f(1)<f(
| C.f(
| D.f(
|
A.2008 | B.2009 | C.2010 | D.2011 |
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