1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
n |
a1an+1 |
1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
1 |
d |
1 |
a1 |
1 |
a2 |
1 |
a2 |
1 |
a3 |
1 |
an |
1 |
an+1 |
1 |
d |
1 |
a1 |
1 |
an+1 |
n |
a1an+1 |
1 |
a1a2 |
1 |
a2a3 |
2 |
a1a3 |
1 |
a1a2 |
1 |
a2a3 |
1 |
ak-1ak |
k-1 |
a1a2 |
1 |
a1a2 |
1 |
a2a3 |
1 |
ak-1ak |
1 |
akak+1 |
k |
a1ak+1 |
k-1 |
a1ak |
1 |
akak+1 |
k |
a1ak+1 |
1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
n |
a1an+1 |
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
A.充分不必要 | B.必要不充分 |
C.充要 | D.既不充分也不必要 |
a |
b |
a |
b |
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
a |
x |
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