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第112頁

信息發(fā)布者：

$?5\sqrt {7}?$

$解:因為?-\frac {1}{a}＞0?$

$所以?a＜0?$

$原式?=-a\sqrt {-a}+\sqrt {(-a2)×(-\frac {1}{a})}?$

$? =-a\sqrt {-a}+\sqrt {a}?$

$?=(1-a)\sqrt {-a}$

$解?：原式$

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

$?=-5\sqrt {3}$

$解:原式$

$?=(\frac {\sqrt {6}}{4}-3\sqrt {3})×\sqrt {6}?$

$? =\frac {\sqrt {6}}{4}×\sqrt {6}-3\sqrt {3}×\sqrt {6}?$

$? =\frac {3}{2}-9\sqrt {2}?$

$解:原式$

$?=2-\sqrt {2}+2\sqrt {2}-2?$

$? =\sqrt {2}$

$解:原式?=\frac {3+2\sqrt {3}+1}{2}??-[(3\sqrt {2})2-(2\sqrt {3})2]?$

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

$? =\sqrt {3}-4$

$解:原式=[(3\sqrt {2}-2\sqrt {3})(3\sqrt {2}+2\sqrt {3})]2?$

$? =[(3\sqrt {2})2-(2\sqrt {3})2]2?$

$? =62?$

$? =36$

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