sn |
(n+18)Sn+1 |
n(n+1) |
2 |
| ||
(n+18)•
|
n |
(n+18)(n+2) |
1 | ||
n+
|
1 |
32 |
1 |
32 |
3 |
2 |
A.f(x1)<f(x2) | B.f(x1)>f(x2) | C.f(x1)=f(x2) | D.不确定 |
A.2008 | B.2009 | C.2010 | D.2011 |
A.[2,3] | B.[1,2] | C.[-1,3] | D.[2,+∞) |
A.y=sinx | B.y=-log2x | C.y=(
| D.y=x-
|
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