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2.9%2.9×0.52脱式计算

2.5×(2.9×0.4) =2.5×0.4×2.9 =1×2.9 =2.9

2.9×9.9+ 0.29 =2.9x9.9+2.9x0.1 =2.9x(9.9+0.1) =2.9x10 =29 运用乘法分配律。 希望能帮到你!

9.9×2/5 =(10-0.1)×0.4 =10×0.4-0.1×0.4 =4-0.04 =9.96

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

9.9X(2/5) =10X(2/5)-(1/10)X(2/5) =2X2-1/25 =4-1/25 =3又25分之24

你好,很高兴为你解答 2/7×9/2×7/9,,这样脱式计算 =9/7x7/9 =1 满意采纳哦!

(九又2/7-7又2/9)÷(5/9+5/9) =2又63分之4÷10/9 =130/63×9/10 =13/7 =1又7分之6

2.9×1.4+7.2除0.25 脱式计算 解:原式=(3-0.1)x1.4+7.2÷0.25 =3x1.4-0.1x1.4+28.8 =4.2-0.14+28.8 =4.06+28.8 =32.86

32.5X2.9+3.45 =32.5X2.9+3.25+0.2 =32.5X(2.9+0.1)+0.2 =32.5X3+0.2 =97.5+0.2 =97.7

应该是 3.2Ⅹ9.9+0.32 =3.2×(9.9+0.1) =3.2×10 =32

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