“微信扫一扫”进入题库练习及模拟考试
计算：
\(\sqrt {0.1} - \sqrt {0.2} + \sqrt {0.4} - \sqrt {0.8} \)．
参考答案：\(\frac{{3\sqrt {10} }}{{10}} - \frac{{3\sqrt 5 }}{5}\)
进入考试题库
