如图,在ΔABC中,AD是高,CE是中线,点G是CE的中点,DG⊥CE,垂足为G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c28efe83-5137-4a20-b2c5-dedc5fdc017e.png?resizew=168)
(1)求证:CD=
AB;
(2)若∠AEC=66°,求∠BCE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c28efe83-5137-4a20-b2c5-dedc5fdc017e.png?resizew=168)
(1)求证:CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)若∠AEC=66°,求∠BCE的度数.
22-23八年级上·江苏泰州·期中 查看更多[3]
江苏省泰州市兴化市2022-2023学年八年级上学期期中数学试题(已下线)第十七章 特殊三角形(B卷-拔高卷)-【单元测试】2022-2023学年八年级数学分层训练AB卷【冀教版】江苏省泰州市兴化市大垛中心校2022-2023学年八年级上学期11月月考数学试题
更新时间:2022-12-03 14:01:40
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解答题-证明题
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名校
【推荐1】如图,△ABC中,∠B =∠C,点D、E分别是边AB、AC上的点,PD平分∠BDE交BC于H,PE平分∠DEC交BC于G,DQ平分∠ADE交PE延长线于Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/9ff73c51-da92-4477-af90-ee036bd90741.png?resizew=128)
(1)∠A+∠B+∠C+∠P +∠Q = °;
(2)猜想∠P与∠A的数量关系,并证明你的猜想;
(3)若∠EGH =112°,求∠ADQ 的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/9ff73c51-da92-4477-af90-ee036bd90741.png?resizew=128)
(1)∠A+∠B+∠C+∠P +∠Q = °;
(2)猜想∠P与∠A的数量关系,并证明你的猜想;
(3)若∠EGH =112°,求∠ADQ 的大小.
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解答题-问答题
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适中
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【推荐2】如图,在
中,已知
,点
、
、
分别在
、
、
上,且
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/16/2464161530347520/2464741843042304/STEM/1def17c3ddb0487cac243e8d2496dc6d.png?resizew=158)
(1)说明
的理由;
(2)说明
的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc382c4f315de17f293d3d273626ade2.png)
![](https://img.xkw.com/dksih/QBM/2020/5/16/2464161530347520/2464741843042304/STEM/1def17c3ddb0487cac243e8d2496dc6d.png?resizew=158)
(1)说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d72ca1ed8c5c1fe07188c621d5ab95.png)
(2)说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2360aad07846d5c503748f01e4490f.png)
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解答题-作图题
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【推荐1】如图,在Rt△ABC中,∠BAC=90°,∠C=30°.
![](https://img.xkw.com/dksih/QBM/2019/8/26/2276995985088512/2279230025629696/STEM/8bdc325eb20343409edc7328fbf95a8f.png?resizew=198)
(1)请在图中用尺规作图的方法作出AC的垂直平分线交BC于点D,交AC于点E (不写作法,保留作图痕迹).
(2)在(1)的条件下,连接AD,求证:△ABC∽△EDA.
![](https://img.xkw.com/dksih/QBM/2019/8/26/2276995985088512/2279230025629696/STEM/8bdc325eb20343409edc7328fbf95a8f.png?resizew=198)
(1)请在图中用尺规作图的方法作出AC的垂直平分线交BC于点D,交AC于点E (不写作法,保留作图痕迹).
(2)在(1)的条件下,连接AD,求证:△ABC∽△EDA.
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【推荐2】如图,在
中,
,点
为
的中点,直线
垂直平分
,点
为线段
上一动点,若
,等腰
面积为21,求
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
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解答题-证明题
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【推荐1】如图,在
中,
,以
为直径的
交
于点D,
,垂足为E.
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
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解答题-作图题
|
适中
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【推荐2】如图,四边形
是平行四边形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/0a67f8e6-14e0-4560-a8ee-935612e1cc21.png?resizew=187)
(1)实践与操作:利用尺规作
的平分线,交
于点
(要求:尺规作图并保留作图痕迹,不写作法,标明字母);
(2)猜想与证明:试猜想线段
,
,
的关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/0a67f8e6-14e0-4560-a8ee-935612e1cc21.png?resizew=187)
(1)实践与操作:利用尺规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)猜想与证明:试猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-问答题
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适中
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【推荐1】在△ABC中,∠B=90°,AC边上的中线BD=5,AB=8,求tan∠ACB的值.
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解答题-证明题
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适中
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【推荐2】通过构造适当的图形,可以对线段长度、图形面积 大小等进行比较,直观地得到一些不等关系或最值,这是“数形结合”思想的典型应用.
(1)【理解】如图①,
,垂足分别为
是
的中点,连接
,已知
,(
).
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989236477288448/3111801543417856/STEM/c62091655fc94d0baaf17b843346ce08.png?resizew=209)
①已知
可以用
表示,请用含
的代数式表示CE的长;
②比较大小:
(填“
”“
”或“
”),并用①中的结论证明该大小关系.
(2)【应用】如图②,在平面直角坐标系中,点
在反比例函数
(
)的图像上,横坐标分别为
.设
,
,记
.
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989236477288448/3111801543417856/STEM/6292db525b814da88ff2d94982662e2f.png?resizew=161)
①当
时,
,当
时,
;
②通过归纳猜想,可得
的最小值是 .请利用图 ② 构造恰当的图形,并说明你的猜想成立.
(1)【理解】如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cbf863433eb006273d26ca7d47099c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be396cbcdc5fb55994f75f1c4e033fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdde5dc58d7ece334bbd04152155cccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e14206c7d228a7c2259a7b27da8813.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989236477288448/3111801543417856/STEM/c62091655fc94d0baaf17b843346ce08.png?resizew=209)
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9a340286faf644ce62e8f342dfaadb.png)
②比较大小:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)【应用】如图②,在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fd6c9f7b7c9fa4822aa81eb13799ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f5d524d18fb926347021d578086b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbca3fb12ed986adced5ead9e0e8368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ad16393af4ece08abecf0e70f0b693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7185daae440233e6c38bbadd8e18b5.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989236477288448/3111801543417856/STEM/6292db525b814da88ff2d94982662e2f.png?resizew=161)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1d0ad635132088d26f021c70ad537d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050294162a78c6f4d6a87849bd3049a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5598d263f6f30194b0c65dd5150da2b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050294162a78c6f4d6a87849bd3049a3.png)
②通过归纳猜想,可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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