選14
理由：217/14取整為15,因為這些事實連續(xù)的,所以15為這一串數(shù)字的中數(shù),即第7 或8 個數(shù),如果第7個數(shù)是15,則第1 個數(shù)是9,第14個數(shù)是22,相加：（9+22）*14/2=217,正好,則14即為答案.
:the sum of 14 consecutive integers is 217,what is the sixth number ini the series
:the sum of 14 consecutive integers is 217,what is the sixth number ini the series
選擇 13 14 15 16 17
選擇 13 14 15 16 17
數(shù)學人氣：387 ℃時間：2020-03-28 11:11:40
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