第67页

信息发布者:
$=(\frac {\sqrt 3}2)^2+(\frac 12)^2$
$=\frac 34+\frac 14$
$=1$
$=\frac {(\frac {\sqrt 2}2)^2+\sqrt 3}1$
$=\frac 12+\sqrt 3$
$=\frac {2×\frac {\sqrt 3}2-1}{\frac 12-2×1}$
$=\frac {\sqrt 3-1}{\frac 12-2}$
$=\frac {2-2\sqrt 3}3$
$=\frac {1-\frac 12}{\frac {\sqrt 3}2}×\frac {\sqrt 3}3$
$=\frac {1}{\sqrt 3}×\frac {\sqrt 3}3$
$=\frac 13$
8
$​\frac {\sqrt 3}2 ​$
$​\frac {\sqrt 3}2 ​$
​$C$​
​$D$​
​$D$​
​$=\sqrt 3×\frac 12+3×\frac {\sqrt 3}2-4×1$​
​$=\frac {\sqrt 3}2+\frac {3\sqrt 3}2-4$​
​$=2\sqrt 3-4$​
​$=\frac {\sqrt 3}3×\frac {\sqrt 2}2+\sqrt 3×\frac {\sqrt 2}2$​
​$=\frac {\sqrt 6}6+\frac {\sqrt 6}2$​
​$=\frac {2\sqrt 6}3$​