A.a9S8>a8S9 |
B.a9S8<a8S9 |
C.a9S8=a8S9 |
D.a9S8与a8S9的大小关系与a1的值有关 |
a1(1-q8) |
1-q |
a1(1-q9) |
1-q |
a12q7 |
1-q |
a12q7 |
1-q |
1 |
an |
A.(1)(3) | B.(3)(4) | C.(1)(2)(3)(4) | D.(2)(3)(4) |
A.16 | B.26 | C.30 | D.80 |
A.180 | B.108 | C.75 | D.63 |
A.8 | B.6 | C.-8 | D.-6 |
A.150 | B.170 | C.190 | D.210 |
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