lim |
n→∞ |
Sn |
S2n |
lim |
n→∞ |
Sn |
S2n |
1 |
2 |
a1(1-qn) |
1-q |
a1(1-q2n) |
1-q |
lim |
n→∞ |
Sn |
S2n |
lim |
n→∞ |
1 |
1+qn |
lim |
n→∞ |
Sn |
S2n |
lim |
n→∞ |
1 |
1+qn |
lim |
n→∞ |
Sn |
S2n |
lim |
n→∞ |
1 |
1+qn |
1 |
2 |
A.6 | B.7 | C.8 | D.9 |
5 |
A.2∈A∩B | B.2∈A∪B | C.2⊆A∩B | D.2⊆A∪B |
A.x2+(1-x)2≤0 | B.|x2-3x+2|≤|x2-x+1| |
C.x2+9<6|x| | D.3x2-2x+1<0 |
A.1 | B.1,3 | C.0,3 | D.0,1 |
1+i |
1-i |
1-i |
1+i |
A.2 | B.4 | C.3 | D.无穷多个 |
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