Question

下列表达式的值是多少？

$\dfrac{1}{10} + \dfrac{2}{20} + \dfrac{3}{30}$

What is the value of the following expression?

$\dfrac{1}{10} + \dfrac{2}{20} + \dfrac{3}{30}$

$.1$

$.123$

$.2$

$.3$

$.6$

知识点：分数

每个分数都等于 $\dfrac{1}{10} = .1$ ，因为 $\dfrac{2}{20} = \dfrac{3}{30} = \dfrac{1}{10}$ 。

所以和是 $.1 + .1 + .1 = .3$ 。

所以正确答案是 D。

Each fraction equals $\dfrac{1}{10} = .1,$ since $\dfrac{2}{20} = \dfrac{3}{30} = \dfrac{1}{10}.$

So the sum is $.1 + .1 + .1 = .3.$

Thus, the correct answer is D .