1 |
k |
1 |
m |
1 |
k |
1 |
m |
am-ak |
m-k |
| ||||
m-k |
1 |
km |
1 |
km |
1 |
km |
km(mk-1) |
2 |
1 |
km |
1+km |
2 |
1+km |
2 |
A.20 | B.22 | C.24 | D.-8 |
a | 2n |
1 |
an•an+1 |
1 |
2 |
1 |
x |
3 |
2 |
1 |
an |
A.等差非等比数列 | B.等比非等差数列 |
C.既是等比又是等差数列 | D.既非等差又非等比数列 |
A.a1+a11>0 | B.a2+a10<0 | C.a3+a9=0 | D.a6=6 |
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