第120页

信息发布者:
解:原式=$\frac{2\sqrt{5}}{5}$
$解:原式=\frac {\sqrt {7×24}}{24}$
= $\frac{\sqrt{42}}{12}$
解:原式= $\frac{\sqrt{ab}}{b}$
$ 解:原式=-5\sqrt {2}×\frac {1}{2\sqrt {2}}×\frac {1}{\sqrt {6}}$
=$-\frac{5\sqrt{6}}{12}$
$解:原式=\frac {15}{8}×\frac {8}{3\sqrt {3}}×\frac {2\sqrt {2}}{5}$
= $\frac{2\sqrt{6}}{3}$
B
B
$\sqrt{14}$
$\frac{mn}{10}$