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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

3.6÷0.4-1.2×5 =9-6 =3

3.4÷(0.5+0.3×4) =3.4÷(0.5+1.2) =3.4÷1.7 =2

(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....

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这个英文乘以0.5和除以二是同一个意思,所以呢,也可以合并同类项吗?所以呢最后的结果就是13.7-3.7的差,乘以0.5,最后那等于10×0.5等于5

3.08×0.5÷0.2 =3.08×0.5×1/5 =3.08×(0.5×1/5) =3.08×0.1 =0.308

(1)0.25×32×0.5,=0.25×(4×8)×0.5,=(0.25×4)×(8×0.5),=1×4,=4;(2)35×17-12×35,=35×(17-12),=35×5,=3;(3)18×(12+23-49+56),=18×12+18×23-18×49+18×56,=9+12-8+15,=21-8+15,=13+15,=28;(4)(50×49×48)÷(25×24)...

(1)4.05÷0.5+10.75=8.1+10.75=18.85(2)21.6÷0.8-1.2×5=27-6=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3=8.4×(6.9÷2.3)=8.4×3=25.2(5)0.38×102 =0.38×(100+2)=0.38×100+0.38×2 =38+0.76...

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