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1、精品文檔,僅供學(xué)習(xí)與交流,如有侵權(quán)請聯(lián)系網(wǎng)站刪除小學(xué)奧數(shù) 找規(guī)律一、知識要點(diǎn)按照一定次序排列起來的一列數(shù),叫做數(shù)列。如自然數(shù)列:1,2,3,4,雙數(shù)列:2,4,6,8,我們研究數(shù)列,目的就是為了發(fā)現(xiàn)數(shù)列中數(shù)排列的規(guī)律,并依據(jù)這個規(guī)律來填寫空缺的數(shù)。按照一定的順序排列的一列數(shù),只要從連續(xù)的幾個數(shù)中找到規(guī)律,那么就可以知道其余所有的數(shù)。尋找數(shù)列的排列規(guī)律,除了從相鄰兩數(shù)的和、差考慮,有時還要從積、商考慮。善于發(fā)現(xiàn)數(shù)列的規(guī)律是填數(shù)的關(guān)鍵。 二、精講精練【例題1】在括號內(nèi)填上合適的數(shù)。(1)3,6,9,12,( ),( )(2)1,2,4,7,11,( ),( )(3)2,6,18,54,( ),(
2、)練習(xí)1:在括號內(nèi)填上合適的數(shù)。(1)2,4,6,8,10,( ),( )(2)1,2,5,10,17,( ),( )(3)2,8,32,128,( ),( )(4)1,5,25,125,( ),( )(5)12,1,10,1,8,1,( ),( )【例題2】先找出規(guī)律,再在括號里填上合適的數(shù)。(1)15,2,12,2,9,2,( ),( )(2)21,4,18,5,15,6,( ),( )練習(xí)2:按規(guī)律填數(shù)。(1)2,1,4,1,6,1,( ),( )(2)3,2,9,2,27,2,( ),( )(3)18,3,15,4,12,5,( ),( )(4)1,15,3,13,5,11,( ),(
3、 )(5)1,2,5,14,( ),( )【例題3】先找出規(guī)律,再在括號里填上合適的數(shù)。(1)2,5,14,41,( ) (2)252,124,60,28,( )(3)1,2,5,13,34,( ) (4)1,4,9,16,25,36,( )練習(xí)3:按規(guī)律填數(shù)。(1)2,3,5,9,17,( ),( ) (2)2,4,10,28,82,( ),( )(3)94,46,22,10,( ),( ) (4)2,3,7,18,47,( ),( )【例題4】根據(jù)前面圖形里的數(shù)的排列規(guī)律,填入適當(dāng)?shù)臄?shù)。510914712111691413(1)9327124363612(3)練習(xí)4:找出排列規(guī)律,在空缺處
4、填上適當(dāng)?shù)臄?shù)。37598121014121614(1)84161683232165151272118927(3)【例題5】按規(guī)律填數(shù)。(1)187,286,385,( ),( )23312541412346433524(2)練習(xí)5:根據(jù)規(guī)律,在空格內(nèi)填數(shù)。(1)198,297,396,( ),( )32543864214526653257(2)37253895234527753425(3)三、課后作業(yè)1、仔細(xì)觀察找出規(guī)律,再填數(shù)。(1)12,1,10,1,8,1,( ),( ),( )(2)3,5,10,12,17,( ),( ),( )(3)3,2,9,2,27,2,( ),( ),( )(
5、4)1,2,2,4,3,8,4,16,5,( ),( ),( )(5)4,24,6,36,8,54,( ),( ),( )2、觀察下面各數(shù)列的規(guī)律,然后在括號里填上適當(dāng)?shù)臄?shù)。(1)1,0,2,5,3,10,4,15,( ),( ),( )(2)1,6,5,10,9,14,13,( ),( ),( )(3)1,2,2,6,3,18,4,54,( ),( )(4)7,14,10,12,14,9,19,5,( ),( )(5)3,1,6,2,12,3,24,4,( ),( ),( )(6)2,3,4,5,8,7,16,9,( ),( )3、先找出規(guī)律,在括號內(nèi)填上適當(dāng)?shù)臄?shù)。(1)5,9,17,33,65,( ),( ),( )(2)1,1,2,3,5,8,13,21,( ),( ),89(3)2,3,5,9,( ),33,65.(4)1,3,7,15,( ),63,127(5)1,4,9,16,25,( ),( ),64,81【精品文檔】第 4 頁