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電子課本網(wǎng) › 第105頁

第105頁

信息發(fā)布者：
?$2\sqrt{6}$?
?$解:當(dāng)?x=\sqrt {5}-1，y=\sqrt {5}+1?時(shí)$?
?$?xy=(\sqrt {5}-1)(\sqrt {5}+1)=4?$?
?$所以原式?=(\mathrm {xy})3=43=64?$?
?$解:原式?=\sqrt {\frac {72}{6}}?$?
?$? =\sqrt {12}?$?
?$? =2\sqrt {3}?$?

?$解:原式?=\sqrt {\frac {3}{2}×6}?$?
?$? =\sqrt {9}?$?
?$? =3$?
?$解:原式?=2\sqrt {\frac {9}{2}÷\frac {9}{4}}?$?
?$? =2\sqrt {2}$?
?$解:原式?=\sqrt {\frac {64}{49}}?$?
?$? =\frac {8}{7}$?
?$ 解:原式?=\frac {\sqrt {3}}{10}? $?
?$ 解:原式?=\frac {5x2}{3y} $?
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