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( )/2.4=3.6/1.2 7.5/( )=2.5/12 2.7/( )=3/9 1.6/...

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

7.5*2.3+1.9*2.5+12.5*0.4 =2.5*3*2.3+1.9*2.5+2.5*5*0.4 =2.5*(6.9+1.9+2) =2.5*10.8 =2.5*(10+0.8) =2.5*10+2.5*0.8 =25+2 =27

7.5-2.45+7.5+2.45 5.09-(0.09+1.23) 9.36...3.35×6.4×2+6.7×3.6 18.7-3.375-6.625 ...24÷2.4-2.5×0.8 671×15-974 469×12+1492 ...

(1)(3.8+12)-(35+2.4÷223)=4.3+1.5,=5.8;(2)(278-2.625)÷0.5%=0.25÷0.005=50;(3)1.9×5-(2.5+127)=9.5-31114,=912-31114,=557;(4)613×1.2+1×323=7.6+323,=735+323,=11415;(5)(314-112)÷312+512,=134÷312+512,=74×...

6.4×0.2+3.6×0.2= 6.25×8= (1.5+0.25)×4= 2.14-0.9= 2.87÷0.7= 1.2×0.4+1.3×0.4= 7.2×0.3+2.8×0.3= 4.9÷3.5= ...

看图:

楼主这是啥意思啊~ 纯粹混经验来的?

而W,D,H是代表宽wide,宽depth,高High 1英寸= 2.539999918 cm 所以: 6 1/4"W x 6 1/2"D x 13 1/2"H=6.25*2.539999918x6.5*2.539999918 x 13.5*2.539999918 =15.875 cm x16.51 cm x 34.29 cm =8987.28 cm^3

简单方法计算 4/5×2.5+12.5×4/25 =4/5×2.5+(2.5×5)×4/25 =4/5×2.5+2.5×(5×4/25) =4/5×2.5+2.5×4/5 =4/5×(2.5+2.5) =4/5×5 =4

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