Question

3.14×0.68-31.4×0.032的简便计算

Answer 1

3.14×0.68-31.4×0.032的简便计算如下：
3.14×0.68-31.4×0.032
=3.14×(0.68-0.32) ←把31.4×0.032中的31.4缩小10倍，0.032扩大10倍后变成3.14×0.32；然后提取公因数3.14
=3.14×(0.3-0.06) ←把(0.68-0.32) 改写为(0.3-0.06)
=3.14×0.3×(1-0.2) ←提取公因数0.3
=0.942×(1-0.2) ←3.14与0.3相乘，得0.942
=0.942+0.1884 ←运用乘法分配律，0.942×1- 0.942×0.2
=1.1304

Answer 2

3.14×0.68-31.4×0.032
= 3.14×0.68-3.14×0.32
= 3.14 x (0.68+0.32) = 3.14

Answer 3

＝3.14×0.68一3.14×0.32
＝3.14×（0.68一0.32）
＝3.14x0.46

Answer 4

3.14 ×0.712