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第99頁

信息發(fā)布者：

$?={\sqrt {\frac {90} {10}}}$

$={\sqrt {9}}$

$=3$

$?={\sqrt {\frac {96} {6}}}$

$=\sqrt {16}$

$=4$

$={\sqrt {\frac {75} {15}}}$

$={\sqrt {5}}$

$={\sqrt {\frac {450} {10}}}$

$={\sqrt {45}}$

$=3{\sqrt {5}}$

$={\sqrt {{\frac {10} {3}}÷{\frac {5} {3}}}}$

$={\sqrt {2}}$

$={\sqrt {75÷15}}$

$={\sqrt {5}}$

$解：{\sqrt {\frac {12} {49}}}={\frac {\sqrt {12}} {\sqrt {49}}}={\frac {2{\sqrt {3}}} {7}}$

?$解：{\sqrt {5{\frac {4} {9}}}}={\sqrt {\frac {49} {9}}}={\frac {\sqrt {49}} {\sqrt {9}}}={\frac {7} {3}}$?

?$解：{\sqrt {\frac {3^2} {4{a}^2}}}={\frac {\sqrt {3^2}} {\sqrt {4{a}^2}}}={\frac {\sqrt {3}b} {2a}}$?

$解：{\sqrt {\frac {2b} {9{a}^{2}}}}={\frac {\sqrt {2b}} {\sqrt {9{a}^{2}}}}={\frac {\sqrt {2b}} {3a}}$

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