Sn |
Tn |
2n+3 |
3n+6 |
a7 |
b5+b7 |
a3 |
b4+b8 |
Sn |
Tn |
2n+3 |
3n+6 |
a7 |
b5+b7 |
a5 |
b4+b8 |
a7 |
2b6 |
a5 |
2b6 |
2a6 |
2b6 |
a1+a11 |
b1+b11 |
S11 |
T11 |
2×11+3 |
3×11+6 |
25 |
39 |
25 |
39 |
A.20 | B.25 | C.10 | D.15 |
A.S6<S5 | B.S5=0 | C.S6=S5 | D.S11=22 |
A.斜率为-1的直线上 | B.斜率为-2的直线上 |
C.斜率为1的直线上 | D.斜率为2的直线上 |
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