如图,
是
的弦,连接
并延长,分别交弦
于点
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616f5eb4957b3be70c84491f38845441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533f1f6ead0d794bb7c70cce9173d4a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
23-24九年级下·全国·课后作业 查看更多[1]
更新时间:2024-04-22 16:09:04
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解答题-证明题
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【推荐1】定义:有一组对角互补的四边形叫做“对补四边形”.
例如:四边形
中,若
或
,则四边形
是“对补四边形”.
概念理解
(1)如图1,四边形
是“对补四边形”.
①若
,则
______;
②若
,且
,
时,求
的值.
拓展延伸
(2)如图2,四边形
是“对补四边形”.当
,且
时,图中
之间的数量关系是______,并证明这种关系.
例如:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be66a4dad3eda57de0458eec62752245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
概念理解
(1)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62e81cfa3e418a50c518c9332af162b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7960538cb70fcf641b94864a90190d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd86bf28de77672d3a026b5159bd527.png)
拓展延伸
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4908fad3dc6fe1b0675c870328f043ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d1c709cbc7baefbc4f22b57991a991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f73dba6fc92d1dc68597979002ef76.png)
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【推荐2】下面是证明三角形中位线定理一种添加辅助线的方法,完成证明.三角形中位线定理:三角形的中位线平行于第三边,并且等于第三边的一半.已知:如图,在
中,D,E分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/ea5da8c2-fc04-4dc9-8197-5331547c112d.png?resizew=312)
求证:
.
证明:如图,延长
至F,使
,连接
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/ea5da8c2-fc04-4dc9-8197-5331547c112d.png?resizew=312)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16460fcc52132ffaf8ef8e7b5fc746e.png)
证明:如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-问答题
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【推荐1】
ABC和
DBC中,∠BAC=∠BDC=90°,延长CD、BA交于点E.
(1)如图1,若AB=AC,试说明BO=EC;
(2)如图2,∠MON为直角,它的两边OM、ON分别与AB、EC所在直线交于点M、N,如果OM=ON,那么BM与CO是否相等?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图1,若AB=AC,试说明BO=EC;
(2)如图2,∠MON为直角,它的两边OM、ON分别与AB、EC所在直线交于点M、N,如果OM=ON,那么BM与CO是否相等?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/2235b090-457a-4ac6-8455-bc9e5a01d3df.png?resizew=315)
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【推荐2】如图,正方形 ABCD 中,P 为 AB 边上任意一点, AE⊥DP 于 E,点 F 在 DP 的延长线 上,且 EF=DE,连接 AF、BF,∠BAF 的平分线交 DF 于 G,连接 GC.
![](https://img.xkw.com/dksih/QBM/2020/9/11/2547473538162688/2549811249045504/STEM/873b9629bd154f1c92383772bb143f56.png?resizew=154)
(1)求证:∠PAE=∠AFD
(2)求证:
是等腰直角三角形
(3)求证:AG+CG =
DG.
![](https://img.xkw.com/dksih/QBM/2020/9/11/2547473538162688/2549811249045504/STEM/873b9629bd154f1c92383772bb143f56.png?resizew=154)
(1)求证:∠PAE=∠AFD
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
(3)求证:AG+CG =
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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