第15页

信息发布者:
C
B
B
$\sqrt{10}+\sqrt{14}$
$1-\sqrt{3}$
$2\sqrt{5}+\sqrt{10}$
60
2
$-2$
解:原式​$=\sqrt {108×\frac {1}{3}}+\sqrt {75÷3}$​
​$ =\sqrt {36}+\sqrt {25}$​
​$ =6+5$​
​$ =11$​
解:原式​$=(3×3\sqrt {3}+\frac {1}{5}×5\sqrt {3}-6×\frac {\sqrt {3}}{3})÷4\sqrt {3}$​
​$ =(9\sqrt {3}+\sqrt {3}-2\sqrt {3})÷4\sqrt {3}$​
​$ =8\sqrt {3}÷4\sqrt {3}$​
​$ =2$​
解:$\sqrt{24}÷\sqrt{3}-\sqrt{\frac{1}{2}}×\sqrt{18}+\sqrt{32}$
$=\sqrt{24÷3}-\sqrt{\frac{1}{2}×18}+4\sqrt{2}$
$=\sqrt{8}-\sqrt{9}+4\sqrt{2}$
$=2\sqrt{2}-3+4\sqrt{2}$
$=6\sqrt{2}-3$
解:$(2\sqrt{3}-\sqrt{5})^2$
$=(2\sqrt{3})^2-2×2\sqrt{3}×\sqrt{5}+(\sqrt{5})^2$
$=12-4\sqrt{15}+5$
$=17-4\sqrt{15}$
C