如图,正△ABC内接于⊙O,P是劣弧BC上任意一点,PA与BC交于点E,有如下结论:① PA=PB+PC,②
;③ PA·PE=PB·PC.其中,正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211682041856/1574211687391232/STEM/f53f7e215e934e9888f3440126c56fe3.png?resizew=105)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e31ccdda98589fb899c4c455b2f5388.png)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211682041856/1574211687391232/STEM/f53f7e215e934e9888f3440126c56fe3.png?resizew=105)
A.3个 | B.2个 | C.1个 | D.0个 |
更新时间:2016-06-21 11:33:25
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【推荐1】如图,在菱形ABCD中,
,E、F分别是AB,AD的中点,DE、BF相交于点G,连接BD,CG.有下列结论:①
;②
;③
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【推荐2】已知有一个正方形,将正方形
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【推荐1】在⊙O中,弦AB所对的圆心角的度数为
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【推荐1】如图,A,C,E,G四点在同一直线上,分别以线段AC,CE,EG为边在AG同侧作等边三角形△ABC,△CDE,△EFG,连接AF,分别交BC,DC,DE于点H,I,J,若AC=1,CE=2,EG=3,则△DIJ的面积是( )
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【推荐2】如图,在
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