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  • 1 # 聽春雨的小樓

    0.25*0.87*4

    =0.25*4*0.87

    =1*0.87

    =0.87

    1.25*0.25*8*4

    =(1.25*8)*(0.25*4)

    =10*1

    =1

    0.2*0.63*5

    =0.2*5*0.63

    =1*0.63

    =0.63

    (40+4)*2.5

    =40*2.5+4*2.5

    =100+10

    =110

    (100+8)*12.5

    =100*12.5+8*12.5

    =1250+100

    =1350

    0.86*(10-2)

    =0.86*10-0.86*2

    =8.6-1.72

    =6.88

    7.6*0.8+0.2*7.6

    =7.6*(0.8+0.2)

    =7.6*1

    =7.6

    1.28*8.6+0.72*8.6

    =(1.28+0.72)*8.6

    =2*8.6

    =17.2

    0.86*15.7-0.86*14.7

    =0.86*(15.7-14.7)

    =0.86*1

    =0.86

    0.325*0.8+1.1*0.325-0.325*0.9

    =0.325*(0.8+1.1-0.9)

    =0.325*1

    =0.325

    3.6-3.6*0.5

    =3.6*1-3.6*0.5

    =3.6*(1-0.5)

    =3.6*0.5

    =1.8

    2.3*99+2.3

    =2.3*99+2.3*1

    =2.3*(99+1)

    =2.3*100

    =230

    0.87*9.9+1.1*0.87-0.87

    =0.87*(9.9+1.1-1)

    =0.87*10

    =8.7

    4.32-4.32*0.9

    =4.32*1-4.32*0.9

    =4.32*(1-0.9)

    =4.32*0.1

    =0.432

    0.87*101

    =0.87*(100+1)

    =0.87*100+0.87*1

    =87+0.87

    =87.87

    0.23*9.9

    =0.23*(10-0.1)

    =0.23*10-0.23*0.1

    =2.3-0.023

    =2.277

    56*10.1

    =56*(10+0.1)

    =56*10+56*0.1

    =560+5.6

    =565.6

    8.5*98

    =8.5*(100-2)

    =8.5*100-8.5*2

    =850-17

    =833

    0.36*3400+36*66

    =0.36*3400+0.36*6600

    =0.36*(3400+6600)

    =0.36*10000

    =3600

    32.5*1130-325*13

    =32.5*1130-32.5*130

    =32.5*(1130-130)

    =32.5*1000

    =32500

    以上題目考察簡便運算的知識點包括:

    乘法交換率、乘法分配率、乘法分配率的逆運算、添加因數“1”、拆分法和小數點移動法。

    解答完畢!

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