Question

下列表达式的值是多少？

$\frac{2}{10} + \frac{4}{100} + \frac{6}{1000}$

What is the value of

$\frac{2}{10} + \frac{4}{100} + \frac{6}{1000}?$

$0.012$

$0.0246$

$0.12$

$0.246$

$246$

知识点：小数位值

按位值把每个分数写成小数

Write each fraction as a decimal using its place value

$\frac{2}{10} = 0.2$ ， $\frac{4}{100} = 0.04$ ， $\frac{6}{1000} = 0.006$ 。

$\frac{2}{10} = 0.2,$ $\frac{4}{100} = 0.04,$ and $\frac{6}{1000} = 0.006$

这三个分数分别表示不同数位上的小数： $\frac{2}{10} = 0.2$ ， $\frac{4}{100} = 0.04$ ， $\frac{6}{1000} = 0.006$ 。

相加得 $0.2 + 0.04 + 0.006 = 0.246$ 。

所以正确答案是 D。

Each fraction is a decimal in a different place: $\frac{2}{10} = 0.2,$ $\frac{4}{100} = 0.04,$ and $\frac{6}{1000} = 0.006.$

Adding these gives $0.2 + 0.04 + 0.006 = 0.246.$

Thus, the correct answer is D .