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8.1÷0.4+0.5的和乘以0.6脱式计算和简便算法

(8.1÷0.4+0.5)×0.6 =(8÷0.4+0.1÷0.4+0.5)×0.6 =(20+0.25+0.5)×0.6 =20×0.6+0.25×0.6+0.5×0.6 =12+0.15+0.3 =12.45

2012年1月28日星期六一、口算题小数加法:0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=16.8+16.5=小数减法:6.8-3.8=4.26-3.71=0.88-2.12=5.34-69.21=68.4-61.5=9.58-3.7=18.94-5.66=15.69-9.78=115-68.59...

(5/8+1/4-2/5)÷1/40 =(25/40+10/40-16/40)x40 =19/40x40 =19

1.46×5+12.8÷0.4×7.5 =1.46×5+3.2×7.5 =1.46x5+3.2x1.5x5 =1.46x5+4.8x5 =(1.46+4.8)x5 =6.26x5 =31.3 希望帮到你 望采纳 谢谢 加油

一、5.4÷1.8+240×1.5 =3+360 =363 二、9000÷72×(1.25×0.7×8) =9000÷72×7 =125×7 =875 三、61-(1.25+2.5×0.7) =61-3 =58 四、[(10-0.8)+9.85]-2÷0.125 =19.05-2÷0.125 =19.05-16 =3.05 1、脱式计算,即递等式计算,需将一系列的数字逐步计算。在...

7.8×0.4+2.2÷5×2 =7.8x0.4+2.2x0.4 =(7.8+2.2)x0.4 =10x0.4 =4

17.5÷0.25×0.4 =70×0.4 =28 按运算顺序计算

解: 7.8÷0.8*2.5 =7又4/5÷4/5 *5/2 =39/5*5/4*5/2 =39/4*5/2 =195/8

(1)0.4×5÷0.4×5,=2÷0.4×5,=5×5,=25;(2)8×25×125×40,=(8×125)×(25×40),=1000×1000,=1000000;(3)(14+1415)-1415,=14+1415-1415,=14+(1415-1415),=14+0,=14.

1.9×4点5+0点45 =1.9x4.5+4.5x0.1 =4.5x(1.9+0.1) =4.5x2 =9

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