【阅读理解】
课外兴趣小组活动时,老师提出了如下问题:
如图1,在
中,若
,
,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法:延长
到点
,使
,请根据小明的方法思考下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/53dacdfe-122d-4e6b-bc31-89d838b5298e.png?resizew=351)
(1)由图可知有一组三角形全等,请用“≌”直接写出这组全等三角形.
(2)求
的取值范围是___________.
【总结感悟】
解题时,条件中若出现“中点”“中线”的字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
【问题解决】
(3)如图2,
是
的中线,
交
于点
,交
于点
,且
.求证:
.
课外兴趣小组活动时,老师提出了如下问题:
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/53dacdfe-122d-4e6b-bc31-89d838b5298e.png?resizew=351)
(1)由图可知有一组三角形全等,请用“≌”直接写出这组全等三角形.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【总结感悟】
解题时,条件中若出现“中点”“中线”的字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
【问题解决】
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822de7d591cd9a09c2b10a39da370385.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4732bb2c0999c315e61da0569269ee1.png)
更新时间:2022-12-10 17:37:43
|
相似题推荐
解答题-作图题
|
适中
(0.65)
名校
【推荐1】【阅读理解】课外兴趣小组活动时,老师提出了如下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b46d864e-7058-4b77-aa73-439941c6811c.png?resizew=213)
如图1,
中,若
,
,求
边上的中线
的取值范围. 小明在组内经过合作交流,得到了如下的解决方法:延长
到点
,使
,请根据小明的方法思考:
(1)由已知和作图能得到
的理由请选择_________
A.
B.
C.
D. ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
(2)AD的取值范围是_________.
(3)【感悟】解题时,条件中若出现“中点”“中线”字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
【问题解决】如图2,
是
的中线,
交
于点
,交
于点
,且
,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b46d864e-7058-4b77-aa73-439941c6811c.png?resizew=213)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
(1)由已知和作图能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab24c24cef4dd5162753308a6631cb01.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef21f6c326b310efdc1bc2f377b2fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9730d8c39620a403e38171c723d3dfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4194089bef4e0d583fc1e69f0e235ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
(2)AD的取值范围是_________.
(3)【感悟】解题时,条件中若出现“中点”“中线”字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
【问题解决】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
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解答题-问答题
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【推荐2】在
中,
.
(1)已知
,求
;
(2)已知
的周长为20,求AB长度的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1816fb0bed72025e79aa4b7185055ce5.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ba8d89cb453540054cee5f83403fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6a66005f4e0f2becf4c4bfdf43960d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】阅读理解:课外兴趣小组活动时,老师提出了如下问题:
在
中,
,
,
边上的中线
的取值范围.
小明在组内经过合作交流,得到了如下的解决方法(如图1):
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d7bfe7c8-a8d2-4e4c-ab98-9d90268ab88e.png?resizew=171)
(1)延长
到Q使得
;(2)再连接
,把
集中在
中;(3)利用三角形的三边关系可得
的取值范围,进而求出
的取值范围.
感悟:解题时,条件中若出现“中点”“中线”等条件,可以考虑倍长中线,构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
(1)求出
的取值范围.
(2)求如图中
与
的位置关系并证明;
(3)思考:已知,如图,
是
的中线,
,
,
,试探究线段
与
的关系,并证明.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f3ddc1c05906d037a3fd793e1c4ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
小明在组内经过合作交流,得到了如下的解决方法(如图1):
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d7bfe7c8-a8d2-4e4c-ab98-9d90268ab88e.png?resizew=171)
(1)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5429298244f478b82ddde50bf46a69de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265264402dfa9999dafc0e6bfcfc94b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
感悟:解题时,条件中若出现“中点”“中线”等条件,可以考虑倍长中线,构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求如图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(3)思考:已知,如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cb6392b1f859954303066037c5f5fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99545dbdb9bd49c6b4b8ff9852a8dae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/68b6bea7-0cf4-4e5f-b7c3-1eb2b8e6a714.png?resizew=159)
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解答题-证明题
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【推荐1】如图,在等边
中,点D、E分别为
、
边上的点,
.连接
、
相交于点F.
![](https://img.xkw.com/dksih/QBM/2023/2/16/3175851883601920/3175991034765312/STEM/86cf1e5c496c43a4be21da1a08f9c5bb.png?resizew=149)
(1)求证:
;
(2)过A作
于点H,当
,
时,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2023/2/16/3175851883601920/3175991034765312/STEM/86cf1e5c496c43a4be21da1a08f9c5bb.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ba85ca2c3cef2e094e57b60738272f.png)
(2)过A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc16a9467a6de4ff5cfccc4316ae871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44dde58a154d817f99b17e0906ca63e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图:在
中,
于Q.
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81023ee8ed4d98d73540f3f4800acc55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/4d9cb406-8ed9-488b-acd4-24ac25485e9d.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a764971824729ffb27922b7a86b402a0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
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解答题-证明题
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【推荐1】如图,在四边形
中,
,
,延长
到E,使
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/980d80c9-5b56-4416-ba5b-0a6ddbd2da9c.png?resizew=202)
(1)求证:
是等腰直角三角形;
(2)若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbce9f8b71f310748170ae6af362da3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4388f8dbb718da77cd86245dd3a1854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/980d80c9-5b56-4416-ba5b-0a6ddbd2da9c.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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适中
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【推荐2】如图,在
中,
,
,D是AB边上一点(点D与A,B不重合),连接CD,将线段CD绕点C按逆时针方向旋转
得到线段CE,连接BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/0a5fa2a9-fb20-4a08-a11d-fba515ccbb86.png?resizew=198)
(1)根据题意将图形补充完整;(要求尺规作图,保留作图狼迹,不写作法)
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/0a5fa2a9-fb20-4a08-a11d-fba515ccbb86.png?resizew=198)
(1)根据题意将图形补充完整;(要求尺规作图,保留作图狼迹,不写作法)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
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