1 |
sn-1 |
1 |
2 |
1 |
6 |
1 |
2-Sn-1 |
1 |
2-Sn-1 |
-1+Sn-1 |
2-Sn-1 |
1 |
Sn-1 |
2-Sn-1 |
Sn-1-1 |
1 |
Sn-1-1 |
1 |
Sn-1 |
1 |
S1-1 |
1 |
Sn-1 |
1 |
n+1 |
n |
n+1 |
A.a19>0,a21<0 | B.a20>0,a21<0 |
C.a19<0,a21>0 | D.a19<0,a20>0 |
A.10 | B.15 | C.30 | D.60 |
A.9 | B.10 | C.11 | D.12 |
1 |
2 |
1 |
2 |
an-1 |
2n |
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