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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

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

9.9X5.5 =10X5.5-0.1X5.5 =55-0.55 =54.45

0.46+0.54括号x1.9

18-7-9 =11-9 =2

0.4x9.9 =0.4*(10-0.1) =0.4*10-0.4*0.1 =4-0.04 =3.96 希望能帮到你学习进步

9.8x9.9+0.98 =9.8*9.9+0.98*1 =9.8*9.9+9.8*0.1 =9.8*(9.9+0.1) =9.8*10 =98

10.1*8-0.8 =10.1*8-0.1*8 =(10.1-0.1)*8 =10*8 =80

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