an |
an+1 |
an+1 |
an |
n(n+1) |
2 |
n(n+1) |
2 |
n |
n+2 |
n+2 |
n |
2 |
n |
2 |
n+2 |
1 |
3 |
1 |
2 |
1 |
4 |
1 |
n |
1 |
n+2 |
2 |
n+1 |
2 |
n+2 |
1 |
x |
A.-
| B.-
| ||||||||
C.x<-
| D.x<-
|
A.a<b<c | B.b<a=c | C.a=b<c | D.a<b=c |
A.
| B.a2+b2≤1 | C.
| D.a2+b2≥1 |
1 |
2 |
1 |
2 |
A.1个 | B.2个 | C.3个 | D.4个 |
2 |
3 |
A.a>b>c | B.a>c>b | C.b>c>a | D.c>b>a |
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