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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

60+2×9 先乘后加 =60+18 =78

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

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

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

720÷9-6×2 =80-12 =68 你好,本题已解答,如果满意 请点右下角“采纳答案”。

9.9×4.6=(10-0.1)×4.6=10×4.6-0.1×4.6=46-0.46=45.54

=25.6×(10-0.1)+2.26 =256-2.56+2.26 =256-(2.56-2.26) =256-0.3 =255.7

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