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43. Let a"n" be the nth term of a geometric sequence,a"7"=32 and a"9"=8, which of following must be ture?
I. a"1">0
II.a"1"-a"2">0
III.a"2"+...+a"100">0
答案都係冇III,冇II,冇I,或三個都有
ans.is A, i chose D
[ 本帖最後由 luigiluigi1113 於 27/4/2009 05:11 PM 編輯 ] |
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