Problem 1003 0 4是等比数列吗？？？不是 2 0 4

CHXCHX | 2015-09-05 20:34:37Author
RT
admin | 2015-09-05 20:35:52# 1
2项 0 4？不是
CHXCHX | 2015-09-05 20:39:28# 2
thanks
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