如图BC是半圆⊙O的直径,D是弧AC的中点,四边形ABCD的对角线AC、BD 交于点E.
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760749af292958b75a7b24113fba8144.png)
P是BD的中点,过P作PQ∥AB交OA于点Q,若AE=3,CD=
,求PQ的长.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760749af292958b75a7b24113fba8144.png)
P是BD的中点,过P作PQ∥AB交OA于点Q,若AE=3,CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
![](https://img.xkw.com/dksih/QBM/2012/1/15/1573329768767488/1573329811562496/STEM/d1d3e6a6bd6d4e1e9f3c30d653170dbe.png?resizew=232)
2012·湖北武汉·中考模拟 查看更多[1]
(已下线)2011—2012学年湖北武汉市卓刀泉中学中考模拟试卷
更新时间:2016-12-05 06:50:36
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【推荐1】综合与实践
问题情境:在综合与实践课上,老师出示了这样一个问题:已知矩形
,
,点
,
分别是边
,
上的点,将矩形
沿
,
所在的直线折叠,使得点
落在点
处,点
恰好落在
上的点
处.
(1)如图
,当点
在
边上时,则
______
,
______ ;
(2)如图
,在图
的基础上,延长
交
于点
,连接
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的形状,并说明理由;
(3)如图
,当
时,若
,请直接写出线段
的长度.
问题情境:在综合与实践课上,老师出示了这样一个问题:已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/2c03f06b-5d1a-4efe-9dec-d372209f1084.png?resizew=552)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e8924d2fb743627552df803087c825.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45292b2cbf7f84510ea196da767e2943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49a5d6130399eca5c050a97d28c97f5.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fbc3a1f1e848cf1349b9327be8607d.png)
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解题方法
【推荐2】如图,在
中,
,
,
,
,
平分
交
边于点D,点E是
边上的一个动点(不与B、C重合),F是
边上一点,且
,
与
相交于点G.
(1)求证:
;
(2)设
,
,求y与x之间的函数关系式,并写出x的取值范围;
(3)当
是以
为腰的等腰三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2269b631c107dac71805624b046f1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b47e5580715c833d57e9159db6c54f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4da037fe7fa1dff1116c17df53a99f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/f9ef7972-6f83-40a9-ab92-0a39e41eaee1.png?resizew=407)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318077e1609ff429cb1abe28f6f84f5e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0a179491094a0b4fd4b04cbd99b2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a875f03062956cd286c6085b65c3c2.png)
(3)当
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名校
【推荐3】在△ABC中,BA=BC,∠ABC=α(0°<α<180°),点P为直线BC上一动点(不与点B,C重合),连接AP,将线段PA绕点P顺时针旋转α度得到线段PQ,连接CQ.
(1)当α=90°,且点P在线段BC上时,过P作PF∥AC交直线AB于点F,如图1,图中与△APF全等的是哪个三角形,∠ACQ的度数.
(2)当点P在BC延长线上,AB:AC=m:n时,如图2,试求线段BP与CQ的比值;
(3)当点P在直线BC上,α=60°,∠APB=30°,CP=4时,请直接写出线段CQ的长.
(1)当α=90°,且点P在线段BC上时,过P作PF∥AC交直线AB于点F,如图1,图中与△APF全等的是哪个三角形,∠ACQ的度数.
(2)当点P在BC延长线上,AB:AC=m:n时,如图2,试求线段BP与CQ的比值;
(3)当点P在直线BC上,α=60°,∠APB=30°,CP=4时,请直接写出线段CQ的长.
![](https://img.xkw.com/dksih/QBM/2019/1/9/2114970277806080/2115894280609792/STEM/4cb44b8e2c6745cead724e1a3e5b779c.png?resizew=480)
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【推荐1】如图,
是
的直径,点
,
是
上的点,且
,
分别与
,
相交于点
,
.
![](https://img.xkw.com/dksih/QBM/2022/10/24/3094431625011200/3094924146139136/STEM/c1394bc6f3eb4487930702c269f4dfa2.png?resizew=156)
(1)若
,求
的度数;
(2)若
,
,求
的直径;
(3)若
的半径为6,
,
是线段
上任意一点,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7606c79c5dc92a9e10178d1979a8db7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f951e874c46b9ee8ac55914f0ee5a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f769d040ba926b022c56960e1b2677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71c75eef9cc8b4c9de454582305a679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
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【推荐2】有这样一道习题:如图1,已知OA和OB是⊙O的半径,并且OA⊥OB,P是OA上任一点(不与O、A重合),BP的延长线交⊙O于Q,过Q点作⊙O的切线交OA的延长线于R.说明:RP=RQ.请探究下列变化:
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294218785431552/2294747888877568/STEM/86aba188268f4f24a18dc528180373e3.png?resizew=503)
变化一:交换题设与结论.
已知:如图1,OA和OB是⊙O的半径,并且OA⊥OB,P是OA上任一点(不与O、A重合),BP的延长线交⊙O于Q,R是OA的延长线上一点,且RP=RQ.
求证:RQ为⊙O的切线.
变化二:运动探究:
(1)如图2,若OA向上平移,变化一中的结论还成立吗?(只需交待判断)
(2)如图3,如果P在OA的延长线上时,BP交⊙O于Q,过点Q作⊙O的切线交OA的延长线于R,原题中的结论还成立吗?为什么?
(3)若OA所在的直线向上平移且与⊙O无公共点,请你根据原题中的条件完成图4,并判断结论是否还成立?(只需交待判断)
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294218785431552/2294747888877568/STEM/86aba188268f4f24a18dc528180373e3.png?resizew=503)
变化一:交换题设与结论.
已知:如图1,OA和OB是⊙O的半径,并且OA⊥OB,P是OA上任一点(不与O、A重合),BP的延长线交⊙O于Q,R是OA的延长线上一点,且RP=RQ.
求证:RQ为⊙O的切线.
变化二:运动探究:
(1)如图2,若OA向上平移,变化一中的结论还成立吗?(只需交待判断)
(2)如图3,如果P在OA的延长线上时,BP交⊙O于Q,过点Q作⊙O的切线交OA的延长线于R,原题中的结论还成立吗?为什么?
(3)若OA所在的直线向上平移且与⊙O无公共点,请你根据原题中的条件完成图4,并判断结论是否还成立?(只需交待判断)
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