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(0.8加8)乘12.5的简便算法

(12.5*8)*0.8

123个0.8相加再乘以12.5 =123x0.8x12.5 =123x(0.8x12.5) =123x10 =1230

12.5×2.5×0.8×40 =(12.5×0.8)×(2.5×40) =10×100 =1000

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*0.8)*2.5*2*23 =10*(2.5*2)*23 =10*5*23 =1150

12.5x0.4x0.8 =(12.5x0.8)x0.4 =10x0.4 =4 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

12.5*0.8*2.5*4 =10*10 =100

不详

0.8×0.25×0.4×12.5的简便运算写法如下: 8x0.25x0.4x12.5 =(8x12.5) x (0.4x0.25) =100x0.1 =10 分析:此题主要根据乘法交换律及结合律计算。当看到这类题型,先把小数当成整数来看,遇到25首先想到4,遇到125首先想到8。还要注意运算顺序和运算...

12.5乘0.4乘0.8的简便算法 12.5乘0.4乘0.8 =12.5*0.8*0.4 =10*0.4 =4

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