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1、找規(guī)律練習(xí)題1:先找出下列數(shù)排列的規(guī)律,并根據(jù)規(guī)律在括號里填上適當(dāng)?shù)臄?shù)。(1)1,4,7,10,( ),16,19(2)1,2,4,7,( ),16,22(3)5,10,15,( ),25,( )(4)2,6,18,54,( ),486總結(jié):變化緩慢用加減,變化劇烈用乘除。2、先找出下列數(shù)排列的規(guī)律,然后在括號里填上適當(dāng)?shù)臄?shù)。(1)3,2,5,2,7,2,( ),( ),11,2(2)1,15,3,13,5,11,( ),( ),9(3)21,4,18,5,15,6,( ),( ),9總結(jié):忽高忽低為混合的單雙數(shù)列,分別尋找兩種的不同規(guī)律。3:請問:魚身上應(yīng)填哪個數(shù)字? 4:根據(jù)A、B兩表圓里
2、各數(shù)的關(guān)系,填出C表中括號里的數(shù)。5:找規(guī)律,寫得數(shù)。(1) 19 =99199 =9009991999 =99000999919999 =9999199999 =999991999999 =(2) 1111 =121111111 =1232111111111 =12343211111111111 =111111111111 =點評:求11.1的平方,通常針對9個1以下的數(shù)的速算,方法是:有幾個1就由1寫到幾,再由大到小寫到1.變式訓(xùn)練:1、先找出下列各列數(shù)的排列規(guī)律,然后在括號里填上適當(dāng)?shù)臄?shù)。(1)2,6,10,14,( ),22,26(2)3,6,9,12,( ),18,21(3)15,2
3、,12,2,9,( ),( )(4)10,11,13,16,20,( ),31(5)1,4,9,16,25,( ),49,64(6)320,1,160,3,80,9,40,27,( ),( )2、智力大比拼,在空白處填上合適的數(shù)。 3、先找出規(guī)律,然后在括號里填上適當(dāng)?shù)臄?shù)。(1)3,6,12,( ),48,( ),192(2)1,6,5,10,9,14,13,( ),( )(3)13,2,15,4,17,6,( ),( )(4)128,64,32,( ),8,( ),2(5)19,3,17,3,15,3,( ),( ),11,3(6)81,64,49,36,( ),16,( ),4,1(7)28,1,26,1,24,1,( ),( ),20,1(8)1,6,4,8,7,10,( ),( ),13,14(9)23,4,20,6,17,8,( ),( ),11,124、根據(jù)前面兩個圈里三個數(shù)的關(guān)系,在第三個圈里的( )里填上適當(dāng)?shù)臄?shù)。102020( )25( )818165、請先計算下面一組算式的前三題,然后找出其中的規(guī)律,并根據(jù)規(guī)律直接寫出后六題的得數(shù)。 18+1=9 128+2=981238+3=98712348+4=9876123458+5=1234568+6=12345678+7=123456788+8=1234567898+9=