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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

$?=\sqrt {\frac {9}{12}÷\frac {54}{12}÷6}?$

$? =\sqrt {\frac {1}{36}}?$

$?=\frac {1}{6}?$

$解:原式?=\frac {2\sqrt {3}}{3}?$

$解:原式?=-\frac {4}{5}\sqrt {5÷\frac {9}{5}}?$

$? =-\frac {4}{5}×\frac {5}{3}?$

$? =-\frac {4}{3}?$

$解:原式?=\frac {\sqrt {120}}{24}?$

$? =\frac {\sqrt {30}}{12}?$

$?-\sqrt {1-a}?$

$解:原式?=\frac {\sqrt {ab}}{a}?$

$解:原式?=\frac {2\sqrt {3}}{3}?$

$解:原式?=-\frac {4}{3}÷\frac {2}{3}\sqrt {18÷8÷54}?$

$? =-2\sqrt {\frac {1}{24}}?$

$? =-\frac {2}{\sqrt {24}}?$

$? =-\frac {\sqrt {6}}{6}$

$解:原式?=\frac {\sqrt {120}}{24}?$

$? =\frac {\sqrt {30}}{12}?$

$解:原式?=-\frac {15}{8}\sqrt {\frac {64}{27}÷\frac {25}{8}}?$

$? =-\frac {15}{8}×\sqrt {\frac {64×8}{27×25}}?$

$? =-\frac {15}{8}×\frac {16\sqrt {2}}{15\sqrt {3}}?$

$? =-\frac {2\sqrt {6}}{3}?$