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510➗(51x2)的简便计算

510➗2➗5 =510➗(2×5) =510➗10 =51

630÷[(84一39)×2]的简便计算 630÷[(84一39)×2] =630➗(45x2) =630➗90 =630➗10➗9 =63➗9 =7

0.8x0.25x0.4x12.5 4.58➗2.5➗0.4 都简便计算过程具体 0.8x0.25x0.4x12.5 =(0.8*12.5)*(0.25*0.4) =10*0.1 =1 4.58➗2.5➗0.4 =4.58÷(2.5*0.4) =4.58÷1 =4.58

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

950+560➗14x28 =950+560➗(14➗28) =950+560x2 =950+1120 =2070

(385/5+245/5)/6=(77+49)/6=126/6=21

420➗5 =(400+20)➗5 =400➗5+20➗5 =80+4 =84

1248➗24 =(1200+48)➗24 =1200➗24+48➗24 =50+2 =52

原式=63x10➗9➗5 =63➗9x(10➗5) =7x2 =14

5800➗(29➗50) =5800➗29X50 =200X50 =10000

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