f2(1)+f(2) |
f(1) |
f2(2)+f(4) |
f(3) |
f2(3)+f(6) |
f(5) |
f2(1005)+f(2010) |
f(2009) |
f(n+1) |
f(n) |
f2(1)+f(2) |
f(1) |
f2(2)+f(4) |
f(3) |
f2(3)+f(6) |
f(5) |
f2(1005)+f(2010) |
f(2009) |
2f(2) |
f(1) |
2f(4) |
f(3) |
2f(2010) |
f(2009) |
|
A.[2,+∞) | B.[-1,0] | C.[-1,0]∪[2,+∞) | D.(-∞,-1]∪(0,2] |
|
A.[-2,1] | B.(-∞,-2] | C.[-2,
| D.(-∞,
|
| ||
n个f |
|
8 |
9 |
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