Question

56.2×0.64+5.62×3.6的简便方法怎么做？

Answer 1

56.2×0.64+5.62×3.6
=56.2×0.64+56.2x0.1×3.6
=56.2x(0.64+0.1x3.6)
=56.2x(0.64+0.36)
=56.2x1
=56.2

Answer 2

56.2×0.64+5.62×3.6
=5.62×6.4+5.62×3.6
=5.62×（6.4+3.6）
=5.62×10
=56.2
运用乘法结合律就可以了。

Answer 3

我们从经验可以先看出64和36这两个数字之间的关系，这两个数字相加起来是100。因此，应该把0.64和3.6化成同一量级。转化后，我们可以看到与他们两个相乘的数字，也因此变得相同。故，可得解。

Answer 4

简便算法：原式=0.79×6.4+0.79×3.6
=0.79×（6.4+3.6）
=0.79×10
=7.9

Answer 5

简便算法：原式=0.79×6.4+0.79×3.6
=0.79×（6.4+3.6）
=0.79×10
=7.9