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青島版六年級(jí)下冊(cè)數(shù)學(xué)基礎(chǔ)知識(shí)歸納(五)(2)

來源:網(wǎng)絡(luò)資源 文章作者:奧數(shù)網(wǎng)整理 2019-07-18 11:13:38


  加法交換律簡(jiǎn)算例子  加法結(jié)合律簡(jiǎn)算例子   乘法交換律簡(jiǎn)算例子  乘法結(jié)合律簡(jiǎn)算例子

  0.875+23 +18            23 +14 +0.8           0.4×33×52          23×0.375×163

  =78 +23 +18             =23 +14 +45            =25 ×33×52         =23×38 ×163

  =78 +18 +23             =23 +(14 +45 )         =25 ×25 ×33        =23 ×(38 ×163 )

  =1+23                 =23 +1               =1×3             =23×2

  含加法交換律與結(jié)合律 含乘法交換律與結(jié)合律     數(shù)字換減法式      數(shù)字換加法式

  0.875+23 +18 +13         0.375×297 ×163 ×729        35×536             101×910

  =78 +23 +18 +13           =38 ×297 ×163 ×729         = (36-1) ×536       = (100+1) ×910

  =78 +18 + 23 +13          =38 ×163 ×297 ×729         =36×536 -1×536     =100×910 +1×910

  = (78 +18 )+ (23 +13 )      = (38 ×163 )×(297 ×729 )     =5-536             =1+910

  =1+1                  =2×1

  乘法分配律提取式   乘法分配律提取式   乘法分配律(添項(xiàng))    乘法分配律(添項(xiàng))

  101×0.9-910 ×1      95.5÷1.6-15.5÷1.6    101×0.9-910        52×58 +29×58 -0.625

  =101×910 -910 ×1    =(95.5-15.5)÷1.6     =101×910 -910       =52×58 +29×58 -58

  =101×910 -1×910     =80÷1.6             =101×910 -1×910    =52×58 +29×58 -1×58

  =(101-1) ×910       =800÷16            =(101-1) ×910       =(52+29-1)×58

  =100×910                               =100×910           =80×58

  減法的性質(zhì)簡(jiǎn)算例子  減法的性質(zhì)簡(jiǎn)算例子  減法的性質(zhì)簡(jiǎn)算例子    數(shù)字換乘法式

  18-58 -0.375          134 -716 -0.75          1225 -(716 +0.4)      0.56×125

  =18-58 -38            =134 -716 -34           =1225 -(716 +25 )      =0.7×0.8×125

  =18-(58 +38 )         =134 -34 -716           =1225 -25 -716         =0.7×(0.8×125)

  =18-1               =1-716               =12-716              =0.7×100

  除法的性質(zhì)簡(jiǎn)算例子  除法的性質(zhì)簡(jiǎn)算例子  除法的性質(zhì)簡(jiǎn)算例子    數(shù)字換乘法式

  3200÷2.5÷0.4      2700÷2.5÷2.7       5900÷(2.5×5.9)       33333×33333

  =3200÷(2.5×0.4)   =2700÷2.7÷2.5      =5900÷5.9÷2.5       =11111×3×33333

  =3200÷1          =1000÷2.5           =1000÷2.5           =11111×99999

  同級(jí)運(yùn)算中,第一個(gè)數(shù)不能動(dòng),后面的數(shù)可以帶著符號(hào)搬家       =11111×(100000-1)

  123 +716 -23        250÷0.8×0.4          123 -716 +13        29×0.25÷0.29

  =123 -23 +716       =250×0.4÷0.8       =123 +13 -716       =29÷0.29×0.25

  =1+716           =100÷0.8            =2-716            =100×0.25

  解方程方法一:消項(xiàng)(如果消+3,方程兩邊就同時(shí)-3 ;如果消×3,方程兩邊就同時(shí)÷3)

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