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12.5×4.8的简便运算.

12.5x4.8 =12.5x8x0.6 =100x0.6 =60

2.1乘12.5乘4.8,该怎么简便运算的

2.1×(12.5×4)×1.2=2.1×60=126

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

6.5÷4.8÷12.5 =6.5÷(4.8×12.5) =6.5÷60 =13/120

(8.4-4.8)÷1.25-0.8 =3.6÷1.25-0.8 =2.88-0.8 =2.08

这样子

12.5X(0.2x8)

12.5×3.2 =125×8×0.4×0.1 =1000×0.04 =40

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