1 |
(an-1)(an+1) |
1 |
(a1-1)(a1+1) |
1 |
(a2-1)(a2+1) |
1 |
(an-1)(an+1) |
1 |
1•3 |
1 |
3•5 |
1 |
(2n-1)(2n+1) |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
2n-1 |
1 |
2n+1 |
1 |
2 |
1 |
2n+1 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
a |
1 |
b |
a+b |
a2+b2 |
A.
| B.-
| C.
| D.-
|
A.104 | B.78 | C.52 | D.39 |
A.{5} | B.{6} | C.{5,6} | D.{7} |
A.4或5 | B.5或6 | C.6或7 | D.7或8 |
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