S1+S2+…+Sn |
n |
A.2010 | B.2011 | C.2012 | D.2013 |
s1+s2+…+s400 |
500 |
11+(11+a1)+(11+a1+a2) +…+(11+a1+…+a500) |
401 |
11×401+s1+s2+…+s400 |
401 |
2005×400 |
401 |
2 |
an+1 |
16 |
21 |
n+1 |
n+2 |
A.有最小值63 | B.有最大值63 | C.有最小值31 | D.有最大值31 |
nπ |
3 |
A.470 | B.360 | C.304 | D.169 |
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