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4.7×9.9脱式计算

4.7×9.9 =4.7×(10-0.1) =4.7×10-4.7×0.1 =47-0.47 =46.53

=9*5=45

9.9*9.9 =(10-0.1)*9.9 =10*9.9-0.1*9.9 =99-0.99 =98.01

21.6×9.9 =21.6×(10-0.1) =21.6×10-21.6×0.1 =216-2.16 =213.84

7.8×9.9脱式计算(能简便的就简便) 7.8×9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22

21.6×9.9 =21.6×(10-0.1) =21.6×10-21.6×0.1 =216-2.16 =213.84

6.8×9.9 =6.8×(10-0.1) =6.8×10-6.8×0.1 =68-0.68 =67.32

4.32x9.9+0.432 =4.32x9.9+4.32x0.1 =4.32x(9.9+0.1) =4.32x10 =43.2

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

18-7-9 =11-9 =2

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