a |
b |
c |
a |
b |
c |
0 |
a |
0 |
a |
b |
c |
0 |
a |
0 |
b |
a |
c |
a |
a |
b |
b |
| ||
|
a |
a |
b |
b |
a |
b |
c |
0 |
a |
0 |
C |
a |
b |
a |
b |
c |
0 |
a |
0 |
a |
b |
c |
0 |
a |
0 |
a |
a |
b |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
A.数列{an}的各项均为正数 | ||
B.数列{an}中必有小于
| ||
C.数列{an}的公比必是正数 | ||
D.数列{an}中的首项和公比中必有一个大于1 |
x2 |
25 |
y2 |
9 |
x2 |
25-k |
y2 |
9-k |
PF1 |
PF2 |
PF1 |
PF2 |
A.①② | B.②③ | C.①③ | D.①②③ |
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