电子课本网 第110页

第110页

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$解​:2\sqrt {3}​和​\sqrt {48}​和​\sqrt {3a²b²}​$
$​\sqrt {8}​和​\sqrt {\frac {1}{2}}​和​\sqrt {18}​$
$解​:原式=(3\sqrt {2}-2\sqrt {2})​+(\sqrt {3}-3\sqrt {3})$
$​ =\sqrt {2}-2\sqrt {3}​$
$解:原式​=(3\sqrt {a}-4\sqrt {a})-(2\sqrt {5}+2\sqrt {5})​$
$​ =-\sqrt {a}-4\sqrt {5}​$
$解:原式​=3\sqrt {3}-2\sqrt {3}+3\sqrt {5}​$
$​ =\sqrt {3}+3\sqrt {5}​$
$解:原式​=\frac {\sqrt {2}}{2}-2\sqrt {3}-\frac {\sqrt {2}}{2}+\frac {2\sqrt {3}}{3}​$
$​ =-\frac {4\sqrt {3}}{3}​$
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