a1+a2 |
2 |
a2+a3 |
2 |
an-1+an |
2 |
| ||
100个 |
1 |
250 |
A.1-
| B.
| C.
| D.2-
|
1 +x |
2 |
x+x 2 |
2 |
x 99+ x 100 |
2 |
1 +x+x+x 2 |
4 |
x+x 2+x 2+x 3 |
4 |
x 98+x 99+x 99+ x 100 |
4 |
| ||
100个 |
1 |
250 |
(x+1) 100 |
2 100 |
1 |
2 50 |
2 |
2 |
2 |
1 |
n+1 |
1 |
n+2 |
1 |
2n+1 |
A.an>an+1 | B.an<an+1 |
C.an=an+1 | D.与n的值有关 |
10 |
2(3n-1) |
A.10 | B.11 | C.12 | D.13 |
1 |
2 |
1 |
4 |
A.
| B.
| C.
| D.
|
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