S3 |
3 |
A.
| B.1 | C.2 | D.3 |
a1+a2+a3 |
3 |
3a2 |
3 |
1 |
S1 |
1 |
S2 |
1 |
S3 |
1 |
Sn |
3 |
4 |
A.40 | B.35 | C.30 | D.25 |
A.S1,S2…S8都小于0,S9,S10…都大于0 |
B.S1,S2…S16都小于0,S17,S18…都大于0 |
C.S1,S2,S3,S4都小于0,S5,S6…都大于0 |
D.S1,S2…S15都小于0,S16,S17…都大于0 |
A.44 | B.22 | C.
| D.88 |
A.18 | B.99 | C.198 | D.297 |
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