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2.6×9.9脱式计算

2.6×1.9÷2.6×1.9 =(2.6÷2.6)×(1.9×1.9) =1×3.61 =3.61

2.6×9.9脱式计算 解:采用凑整法和分配律的简便方法, 原式=2.6x(10-0.1) =2.6x10-2.6x0.1 =26-0.26 =25.74

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

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

4.635

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

5x9-36 =45-36 =9

9.9×16.5 =(10-0.1)*16.5 =10*16.5-0.1*16.5 =165-1.65 =163.35

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

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