第104页

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B
$解:原式​=\frac {\sqrt{2}}{\sqrt{5}}​$
$​ =\frac {\sqrt{10}}5​$
$解：原式​=\sqrt{\frac 87}​$
$​ =\frac {2\sqrt{14}}7​$
$解:原式​=\sqrt{3²×\frac {1}{3}}​$
$​=\sqrt{3}$
$解：原式​=\frac {\sqrt{b}}{\sqrt{2a}}​$
$​ =\frac {\sqrt{2ab}}{2a}​$
$解:原式​=\frac {\sqrt{7}×\sqrt{2}}{\sqrt{2}×\sqrt{2}}​$
$​ =\frac {\sqrt{14}}2​$
$解:原式​=\frac {2}{3\sqrt{2}}​$
$​=\frac {\sqrt{2}}{3}​$
$解：原式​=\frac {3×\sqrt{6x}}{\sqrt{6x}×\sqrt{6x}}​$
$​ =\frac {\sqrt{6x}}{2x}​$
$解：原式​=\frac {2×\sqrt{2b}}{a×\sqrt{2b}×\sqrt{2b}}​$
$​ =\frac {\sqrt{2b}}{ab}​$
​D
$解:原式​=\sqrt{\frac {4}{3}}​$
$​=\frac {2\sqrt{3}}{3}​$
$解:原式​=9×\frac {\sqrt{2}}{\sqrt{3}}​$
$​=3\sqrt{6}​$
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