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1.9x9.9+0.19用简便的脱式计算

原式=1.9×(1-0.9) =1.9×0.1 =0.19

18.9*9.9 =18.9*(10-0.1) =18.9*10-18.9*0.1 =189-1.89 =187.11

自己算吧

1.9+19点9+199点9+0点3 =2-0.1+20-0.1+200-0.1+0.3 =(2+20+200)-(0.1+0.1+0.1)+0.3 =222-0.3+0.3 =222

2.1*9.9+0.21 =0.21*99+0.21 =0.21*(99+1) =0.21*100 =21

脱式计算 1.9x5.3+0.53 =10.07=0.53 =10.6 简算 =1.9x5.3+5.3×0.1 =5.3×(1.9+0.1) =5.3×2 =10.6

原式=(8.1+1.9)+(6.93+0.07)=10+7=17

根据题意可得,原式=9.4*(10-0.1)=9.4*10-9.4*0.1=94-0.94=93.06

7.86x9.9+7.86x0.1 =7.86x(9.9+0.1) =7.86x10 =78.6

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