A.
| B.
| C.2 | D.4 |
10(10-1)d |
2 |
5(5-1)d |
2 |
a |
d |
5 |
10 |
1 |
2 |
1 |
2 |
A.22 | B.33 | C.44 | D.55 |
A.58 | B.88 | C.143 | D.176 |
A.是等比数列但不是等差数列 |
B.是等差数列但不是等比数列 |
C.既是等比数列又是等差数列 |
D.既不是等比数列又不是等差数列 |
A.5,2 | B.5,-2 | C.
| D.
|
A.bn=|an| | B.bn=an2 | C.bn=
| D.bn=1-an |
© 2017-2019 超级试练试题库,All Rights Reserved.