b2 |
2 |
b3 |
22 |
bn |
2n-1 |
anan+1an+2 |
bn+1 |
|
|
b2 |
2 |
b3 |
22 |
bn |
2n-1 |
b2 |
2 |
b3 |
22 |
bn-1 |
2n-2 |
bn |
2n-1 |
|
anan+1an+2 |
bn+1 |
an+1an+2an+3 |
bn+2 |
7 |
2 |
Sn |
Tn |
n |
n+1 |
a10 |
b9 |
a9 |
b10 |
A.1 | B.
| C.
| D.
|
A.45份 | B.50份 | C.60份 | D.65份 |
A.40 | B.20 | C.
| D.
|
A.甲 | B.乙 | C.两厂一样 | D.无法确定 |
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