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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

6×9-9=9*(6-1)=9*5=45

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

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

=9.4×(1.23+0.77) =9.4×2 =18.8

9.99×9+9.99 =9.99x(9+1) =9.99x10 =99.9 谢谢,请采纳

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

=12.7x9.9+12.7x0.1 =12.7x(9.9+0.1) =127

3.47×9.9+0.347 =0.347×99+0.347 =0.347×(99+1) =0.347×100 =34.7 希望能帮到你, 祝你学习进步,不理解请追问,理解请及时采纳!(*^__^*)

18-7-9 =11-9 =2

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