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$解:原式=-\frac {4}{5}\sqrt {5÷\frac {9}{5}}$
$ =-\frac {4}{5}×\frac {5}{3}$
$ =-\frac {4}{3}$
$解:原式=\sqrt {\frac {10}{3}÷\frac {3}{2}}$
$ =\sqrt {\frac {20}{9}}$
$ =\frac {2\sqrt {5}}{3}$
$-\sqrt {1-a}$
解:原式
$=\sqrt {\frac {9}{12}÷\frac {54}{12}÷6}$
$ =\sqrt {\frac {1}{36}}$
$=\frac {1}{6}$
$解:原式=\frac {2\sqrt {3}}{3}$
$解:原式=-\frac {4}{5}\sqrt {5÷\frac {9}{5}}$
$ =-\frac {4}{5}×\frac {5}{3}$
$ =-\frac {4}{3}$
$解:原式=\frac {\sqrt {120}}{24}$
$ =\frac {\sqrt {30}}{12}$
$-\sqrt {1-a}$
$解:原式=\frac {\sqrt {ab}}{a}$
$解:原式=\frac {2\sqrt {3}}{3}$
$解:原式=-\frac {4}{3}÷\frac {2}{3}\sqrt {18÷8÷54}$
$ =-2\sqrt {\frac {1}{24}}$
$ =-\frac {2}{\sqrt {24}}$
$ =-\frac {\sqrt {6}}{6}$
$解:原式=\frac {\sqrt {120}}{24}$
$ =\frac {\sqrt {30}}{12}$
$解:原式=-\frac {15}{8}\sqrt {\frac {64}{27}÷\frac {25}{8}}$
$ =-\frac {15}{8}×\sqrt {\frac {64×8}{27×25}}$
$ =-\frac {15}{8}×\frac {16\sqrt {2}}{15\sqrt {3}}$
$ =-\frac {2\sqrt {6}}{3}$
$解:原式=\frac {\sqrt {ab}}{a}$
$解:原式=-\frac {4}{3}÷\frac {2}{3}\sqrt {18÷8÷54}$
$ =-2\sqrt {\frac {1}{24}}$
$ =-\frac {2}{\sqrt {24}}$
$ =-\frac {\sqrt {6}}{6}$
$解:原式=-\frac {15}{8}\sqrt {\frac {64}{27}÷\frac {25}{8}}$
$ =-\frac {15}{8}×\sqrt {\frac {64×8}{27×25}}$
$ =-\frac {15}{8}×\frac {16\sqrt {2}}{15\sqrt {3}}$
$ =-\frac {2\sqrt {6}}{3}$
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