计算:(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802016_ST/0.png)
-1)
+(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802016_ST/1.png)
)
-1-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802016_ST/2.png)
+2sin60°.
考点分析:
相关试题推荐
我国汉代数学家赵爽为了证明勾股定理,创制了一副“弦图”,后人称其为“赵爽弦图”(如图1).图2由弦图变化得到,它是由八个全等的直角三角形拼接而成.记图中正方形ABCD,正方形EFGH,正方形MNKT的面积分别为S
1,S
2,S
3,若S
1+S
2+S
3=10,则S
2的值是
.
查看答案
双曲线y
1、y
2在第一象限的图象如图,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802014_ST/0.png)
,过y
1上的任意一点A,作x轴的平行线交y
2于B,交y轴于C,若S
△AOB=1,则y
2的解析式是
.
查看答案
如图,在Rt△ABC中,∠ACB=90°,D、E、F分别是AB、BC、CA的中点,若CD=5cm,则EF=
cm.
查看答案
如图,在△ABC中,AB=2,AC=1,以AB为直径的圆与AC相切,与边BC交于点D,则AD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802011_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922643880228/SYS201311011929226438802011_ST/2.png)
D.
查看答案