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求20.5*0.12的最简便算法

20-12.5*0.12 =20-1.5 =18.5 没有简算,直接计算

20-12.5×0.12 =20-12.5x4x0.03 =20-50x0.03 =20-1.5 =18.5

red

12.5×3.2 =25×0.5×0.4×8 =25×8×0.5×0.4 =200×0.2 =40

求“0.8 x 0.25 x 0.4 x 12.5 =”的简便运算 运算思路:先按照相乘化整数的方法,0.8乘以12.5等于10,0.4乘以0.25等于0.1,再计算10乘以0.1等于1。 0.8 X 0.25 X 0.4 X 12.5 = ( 0.8 X 12.5 ) X ( 0.25 X 0.4) = 10 X 0.1 = 1

12.5×4.5+4.5×12.5+12.5 =12.5×(4.5+4.5+1) =12.54×10 =125

3又3/5*25又2/5+37.9*6又2/5 =3.6*25.4+25.4*6.4+12.5*6.4 =(3.6+6.4)*25.4+12.5*8*0.8 =10*25.4+100*0.8 =254+80 =334

0.8×0.25×0.4×12.5=0.25×0.4×0.8×12.5=0.1×10=1

不详

简便计算20-12.5乘0.12 =20-12.5×4×0.03 =20-50×0.03 =20-1.5 =18.5

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