Question

2.4x2.5x12.5简便运算？

Answer 1

由题意得：
2.4x2.5x12.5
=(0.6x4)x2.5x12.5
=0.6x4x2.5x12.5
=4x2.5x0.6x12.5
=(4x2.5)x(0.6x12.5)
=(4x2.5)x(0.6x5x2.5)
=10x(3x2.5)
=10x7.5
=75
这就是其简便运算过程！

Answer 2

简便计算

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=2.5*0.3*8*12.5

=0.75*100

=75

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过程如上过程

Answer 3

简便计算
2.4x2.5x12.5
=0.3x8x2.5x12.5
=（0.3x2.5）x（8x12.5）
=0.75x100
=75

追问

3.7Ⅹ8.3+8.3Ⅹ5.3+8.3简便算法

急！！！

追答

3.7Ⅹ8.3+8.3Ⅹ5.3+8.3

=（3.7+5.3+1）x8.3
=10x8.3
=83

追问

谢谢！

Answer 4

2.4x2.5x12.5
=0.6x4x2.5x12.5
=0.6x10x12.5
=6x12.5
=75

Answer 5

这种题我们就要有一定的储备知识，例如4×25，125×8。这些常规的知识一定要具备。这样的话我们就会想到凑整，我们就把2.4分解为0.4×6
上式就可以变化为
6×0.4×2.5×12.5
＝12.5×6×（0.4×2.5）
＝75×1
＝75

追问

3.7x8.3+8.3x5.3+8.3简便算法

急！！！

追答

提取公因数8.3
8.3×（3.7+5.3+1）
＝8.3×10
＝83