maths~~~~~~

2010-04-03 5:58 pm
若在一個有無限項的等比數列中,首兩項的和是其餘所有項總和的三倍,求公比。

回答 (1)

2010-04-03 6:32 pm
✔ 最佳答案
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2010-04-03 10:32:18 補充:
http://img521.imageshack.us/img521/848/81557467.png


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