考点分析:
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下列计算正确的是( )
A.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/0.png)
+4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/1.png)
=6
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/3.png)
=4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/5.png)
÷
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/6.png)
=3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811001_ST/7.png)
=-3
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2
-1的相反数是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811000_ST/0.png)
B.-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803081101/SYS201310221642038030811000_ST/1.png)
C.2
D.-2
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以坐标原点为圆心,1为半径的圆分别交x,y轴的正半轴于点A,B.
(1)如图一,动点P从点A处出发,沿x轴向右匀速运动,与此同时,动点Q从点B处出发,沿圆周按顺时针方向匀速运动.若点Q的运动速度比点P的运动速度慢,经过1秒后点P运动到点(2,0),此时PQ恰好是⊙O的切线,连接OQ.求∠QOP的大小;
(2)若点Q按照(1)中的方向和速度继续运动,点P停留在点(2,0)处不动,求点Q再经过5秒后直线PQ被⊙O截得的弦长.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203802806054/SYS201310221642038028060028_ST/images0.png)
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将一块三角板的直角顶点放在正方形ABCD的对角线交点位置,两边与对角线重合如图甲,将这块三角板绕直角顶点顺时针方向旋转(旋转角小于90°)如图乙.
(1)试判断△ODE和△OCF是否全等,并证明你的结论.
(2)若正方形ABCD的对角线长为10,试求三角板和正方形重合部分的面积.
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已知AB是⊙O的直径,AP是⊙O的切线,A是切点,BP与⊙O交于点C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203802806054/SYS201310221642038028060026_ST/images0.png)
(1)如图①,若AB=2,∠P=30°,求AP的长(结果保留根号);
(2)如图②,若D为AP的中点,求证:直线CD是⊙O的切线.
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