n+1 |
2 |
1 |
a1•a3 |
1 |
a2•a4 |
1 |
an•an+2 |
n+1 |
2 |
1 |
anan+2 |
4 |
(n+1)(n+3) |
1 |
n+1 |
1 |
n+3 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
n+1 |
1 |
n+3 |
1 |
2 |
1 |
3 |
1 |
n+2 |
1 |
n+3 |
5n2+25n+24 |
3(n+2)(n+3) |
π |
2 |
x |
2 |
A.O | B.-9 | C.9 | D.1 |
2n |
2n |
|
A.22012 | B.22013 | C.42012 | D.42013 |
BC |
n+1 |
2 |
A.1232 | B.2580 | C.3019 | D.4321 |
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