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電子課本網(wǎng) 第112頁

第112頁

信息發(fā)布者:
$ \frac{3\sqrt{2}}{2}$
$ 30\sqrt{2}$
3
$21-4\sqrt{5}$
$?2{\sqrt {10}}+4{\sqrt {5}}$
$ -3a$
$?-{\frac {\sqrt {5}} {2}}$
$ 8或-8$
$解:原式 =({\frac {2} {3}×{\frac {3} {4}}})×({\sqrt {6}×{\sqrt {24}}})$
$\ \ \ \ \ \ \ \ ={\frac {1} {2}}×12$
$\ \ \ \ \ \ \ \ =6$
$解:原式 =(12{\sqrt {3}-6{\sqrt {3}}})÷{\sqrt {3}}$
$\ \ \ \ \ \ \ \ =6{\sqrt {3}}÷{\sqrt {3}}$
$\ \ \ \ \ \ \ \ =6$
$解:原式 ={\sqrt {10}}×3{\sqrt {\frac {2} {5}}}-{\sqrt {10}×{\sqrt {\frac {5} {2}}}}$
$ =3×{\sqrt {10×{\frac {2} {5}}}}-{\sqrt {10×{\frac {5} {2}}}}$
$ =3×2-5$
$ =1$
$解:原式 =6{\sqrt {3}}÷({\sqrt {3}-2{\sqrt {3}}})$
$\ \ \ \ \ \ \ \ =6{\sqrt {3}}÷(-{\sqrt {3}})$
$\ \ \ \ \ \ \ \ =-6$