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1.2×5.2一2.5÷0.3用简便方法计算

1.2×5.2一2.5÷0.3 =1.2x(5+0.2)-(2.4+0.1)÷0.3 =1.2x5+1.2x0.2-2.4÷0.3-0.1÷0.3 =0.3x4x5+0.24-8-1/3 =0.3x20+0.24-8-1/3 =6+0.24-8-1/3 =-2+0.24-1/3 ≈-2+0.24-0.34 =-2-0.1 =-2.1

1.2×(5.2-2.5)÷0.3的脱式答案 解: 1.2×(5.2-2.5)÷0.3 =1.2x2.7÷0.3 =3.24÷0.3 =10.8

1.2(5.2-2.5)/0.3=0.4×2.7=1.08

5.2÷1.3÷0.5 =4÷0.5 =8

1.2乘5.2减2.5除0.3简便计算 1.2乘5.2减2.5除0.3 =1.2*5.2-2.5÷0.3 =6.24- 2.5÷0.3 结果不是有限小数 核实算式

如上图所示。

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

(1)4.82-5.2÷0.8×0.6,=4.82-6.5×0.6,=4.82-3.9,=0.92;(2)[ 1 2 -( 3 4 - 3 5 )]÷ 7 10 ,=[ 1 2 - 3 20 ]÷ 7 10 ,= 7 20 ÷ 7 10 ,= 1 2 ;(3) 7 9 × 5 11 + 2 9 × 5 11 ,=( 7 9 + 2 9 )× 5 11 ,=1× 5 11 ,= 5 11 ;(4)12....

1/(0.2/0.3)/(0.3/0.4)/(0.4/0.5) =1÷0.2×0.3÷0.3×0.4÷0.4×0.5 =1÷0.2×0.5 =5×0.5 =2.5 供参考,有疑问请追问

5.1x0.3 +5.2x0.3 …… 5.8x0.3 +5.9x0.3 =0.3×【(5×9)+(0.1+0.2…0.9)】 =0.3×【45+4.5】 =0.3×49.5 =0.3×(50-0.5) =0.3×50-0.3×0.5 =15-0.15 =14.85

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