15    5    12    5    9    5
6
6
分析:觀察給出的數(shù)列,知道奇數(shù)項(xiàng)上的數(shù)是它前面奇數(shù)項(xiàng)上的數(shù)減3所得,偶數(shù)項(xiàng)的數(shù)都是5,由此得出答案.
解答:解:因?yàn)橐蟮臄?shù)是第7項(xiàng),是奇數(shù)項(xiàng),
所以9-3=6,
故答案為:6.
點(diǎn)評:對于找規(guī)律的題目首先應(yīng)找出哪些部分發(fā)生了變化,是按照什么規(guī)律變化的.
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1
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2
3
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2
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4
9
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8
11
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17
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