1 |
an+1 |
A.1 | B.
| C.
| D.
|
1 |
an+1 |
1 |
an+1 |
1 |
a4+1 |
1 |
a8+1 |
1 |
a12+1 |
1 |
a8+1 |
1 |
a4+1 |
1 |
a12+1 |
1 |
2 |
1 |
3 |
1 |
a12+1 |
1 |
a12+1 |
2 |
3 |
3 |
2 |
1 |
2 |
A.12 | B.5 | C.2 | D.1 |
A.若x∈R且x≠0,则x+
| ||
B.在△ABC中,若sin2A=sin2B,则△ABC是等腰三角形 | ||
C.对等差数列{an}的前n项和Sn,若对任意正整数n都有Sn+1>Sn,则an+1>an对任意正整数n恒成立 | ||
D.a=3是直线ax+2y+3a=0与直线3x+(a-1)y=a-7平行且不重合的充要条件 |
A.18 | B.-18 | C.15 | D.12 |
bn |
an |
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