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28 0.25简算方法脱式

0.25*28=0.25*(4*7)=0.25*7*0.25*4=1.75*1=1.75

2.8*3.6+6.4*2.8=2.8*(3.6+6.4)=2.8*10=28

27除以0.25=(27*4)÷(0.25*4)=108÷1=108

1.28/0.25/4=1.28/(0.25x4)=1.28/1=1.28

3.6*0.25 =4*0.9*0.25 =4*0.25*0.9 =1*0.9 =0.9

解:(1)2.5*1.2+0.25*28,=0.25*12+0.25*28,=0.25*(12+28),=0.25*40,=10;(2)1.9+19.9+199.9+0.3,=1.9+19.9+199.9+0.1+0.1+0.1+0.1,=(1.9+0.1)+(19.1+0.1)+(199.9+0.1),=2+20+200,=222.

简便方式 0.2510.4=0.25*(10+0.4)=0.25*10+0.25*0.4=2.6脱式方式 0.2510.4=2.6

4.28*0.25=(4+0.28)*1/4=4*1/4+0.28*1/4=1+0.07=1.07

1.48x0.25=1x0.25+ 0.4x0.25 + 0.08x0.25=0.25 + 0.01 + 0.02=0.28

0.25*32*12.5=0.25*(4*8)*12.5=(0.25*4)*(8*12.5)=1*100=100

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