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2.6×9.9脱式计算

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

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

60+2×9 先乘后加 =60+18 =78

9.9x6.8 =(10-0.1)x6.8 =10x6.8-0.1x6.8 =68-0.68 =67.32

2.6x3/14-9/70 =7.8/14-9/70 =39/70-9/70 =3/7

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”。

2.62÷2.9的简便运算脱式 2.62÷2.9 = 结果不是有限小数 核实算式

7.2×(10-0.1) =7.2×10-7.2×0.1 =72-0.72 =71.28

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