1 . 命题:在同一平面内,垂直于同一直线的两条直线互相平行,画出图形,写出该命题的已知、求证,并证明.
您最近一年使用:0次
2 . 完成下面的证明过程.
已知:如图,
,求证:
平分
.
(已知),
( ),
( ),
又
(已知),
( ),
平分
( )
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae4dfa9539ea5d1b9957f6f52a8f9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6706c88443ead35c76bcf2f3ec24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78163b1e78c917f86dc961a038329ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064c359bafcd1841d582707419d1ac2d.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7a0621aafbc7e55cd6f6b9686c214b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb74854a2ddf9c137853bd6476af609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e24c2bdad41127f07c6639a357d2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
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3 . 已知:若两个等腰三角形有公共底边,则称这两个等腰三角形的顶角的顶点关于这条底边互为顶针点;若再满足两个顶角和是
,则称这个两个顶点关于这条底边互为勾股顶针点.如图1,四边形
中,
是一条对角线,
,则点
与点
关于
互为顶针点:若再满足
,则点
与点
关于
互为勾股顶针点.
【初步思考】(1)如图2,在
中,
,
,
为
外两点,
,
,
为等边三角形.
①点
与点______关于
互为顶针点;
②求证:点
与点
关于
互为勾股顶针点.
【实践操作】(2)在长方形
中,
.
①如图3,点
在
边上,点
在
边上,请用圆规和无刻度的直尺作出点
、
,使得点
与点
关于
互为勾股顶针点.(不用证明,不写作法,保留作图痕迹)
【思维探究】②如图4,点
是线段
上的动点,点
是平面内一点,点
与点
关于
互为勾股顶针点,直线
与直线
交于点
,在点
运动过程中,当线段
与线段
的长度相等时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9848996becfe03d1c31a351b41f39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a236b75094edf82e892d7c7dd5bf28fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【初步思考】(1)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd260fb9d772c122dcb1df52cbe38ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f40622681bcdce18b8f06c81edfb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【实践操作】(2)在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1180becb67241bd334a37e0decb68725.png)
①如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
【思维探究】②如图4,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
4 . 如图,四边形
是矩形,连接
交于点
平分
交
于点
.
的角平分线交
于点
,连接
;(保留作图痕迹,不写作法与结论)
(2)求证:四边形
是平行四边形.
证明:∵四边形
是矩形,
∴
,
∴ ① ,
∵
平分
平分
,
∴
,
∴ ② .
∵在
和
中,
,
∴
,
∴ ④ ,
又∵
,
∴四边形
是平行四边形( ⑤ ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d0b0b7d07ac1aebab6b6f1e8c6acdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a635d7620abb851e2131c63668396e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269285cf47de45209780078b523ebf46.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff045361a1774085165769608ec4401.png)
∴ ① ,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa6f95394a0d93e62ed95035253799d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f9b99890e5650853f830170dccea6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f12a744bfd62512d7b186a5fc09a088.png)
∴ ② .
∵在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea46133f0ce8a230e503f150955c6d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684f55970df210065eaa81b898bfdb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74792ff1e3ffcacc916a7f1f0228647.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce68b67af24054b057157759cf5417c1.png)
∴ ④ ,
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0944865f14b13a772526c4cae4f29c99.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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5 . 如图,已知
,射线
交
于点F,交
于点D.从D点引一条射线
,若
,求证:
.
(已知),
且
____(______),
∴
(______),
∴
(______),
∴
______
(______),
又∵
(已知),
∴
______(______),
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7338856efe43dac491864dc1e9bdde90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91468aa8289eb6d36bd5991b5daddb94.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53df2a88f461611f7159d0f2f8ef60e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c145919ebf3657c5e5682b9a78eb1ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7338856efe43dac491864dc1e9bdde90.png)
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6 . 已知:如图所示,
交于点O,
平分
与
相交于点F,
平分
与
相交于点E,
.补全下列证明过程.
.
证明:∵
,
∴
(________),
∴
(_______).
∵
平分
,
平分
,
∴
________,
________(________),
∴
(________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcabb6fa6da15ec93209d21671b7055a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c01518bd608069d449dfe185f1fccea.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4208adc6ee623bfc2134d8816b5834e.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcabb6fa6da15ec93209d21671b7055a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce4f975916052e325b2d7b6c58f9ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6e08342b416324299c65553c86904.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c01518bd608069d449dfe185f1fccea.png)
您最近一年使用:0次
2024-06-18更新
|
53次组卷
|
2卷引用:甘肃省平凉市庄浪县思源实验学校2023-2024学年七年级下学期期中数学试题
7 . 【综合与实践】
【探究】(1)小学我们就学过同底等高的两个三角形的面积相等,后来我们又学到等高的两个三角形的面积之比等于与高对应的底边长之比,如图(1),
的高
和
的高
相等,则
同样,同底的两个三角形,如果面积相等,也有类似的结论,若图形位置特殊,由此会产生一些新的结论,下面是小江同学探索的一个结论,请帮助小江完成证明.
和
的面积相等,求证:
.
证明:分别过点
、点
作
和
底边
上的高线
,
.
【应用】(2)把图(3)的四边形
改成一个以
为一边的三角形,并保持面积不变,请画出图形,并简要说明理由.
【拓展】(3)用上述探究的结论和已经证明的结论,证明三角形的中位线定理.
已知:如图(4),______.
求证:______.
证明:
【探究】(1)小学我们就学过同底等高的两个三角形的面积相等,后来我们又学到等高的两个三角形的面积之比等于与高对应的底边长之比,如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301941880d65680d8133f05b2785ce64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
证明:分别过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
【应用】(2)把图(3)的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【拓展】(3)用上述探究的结论和已经证明的结论,证明三角形的中位线定理.
已知:如图(4),______.
求证:______.
证明:
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2024-06-17更新
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120次组卷
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2卷引用:浙江省杭州市萧山城区8校联考2023-2024学年九年级下学期4月期中考试数学试题
8 . 请把下列证明过程及理由补充完整(填在横线上)
已知:如图,
,
.
求证:
.
(已知),
且
,( ① )
∴
.(等量代换)
∴
.( ② )
∴ ③
.(两直线平行,同位角相等)
∵
,(已知)
∴
.(等量代换)
∴
.( ④ )
∴
.( ⑤ )
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1839e1828b5d6f596b2b023504479208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2551d99e91a12eb8d45c976f714e8f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e5d879e539ef2bbee6156f70503160.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee9e9b89278a44b24a1580d8b2ae1fe.png)
∴ ③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc89b88c177060485151747563903d4.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c461ce49f5064605d2e7c59d66dc8bcd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1839e1828b5d6f596b2b023504479208.png)
您最近一年使用:0次
9 . 请把下面证明过程补充完整.
,
,
.
求证:
.
证明:∵
,
(______________),
∴
(______________).
∴________
________(__________________________________).
∴
(______________________________).
又∵
(已知),
∴____________(等量代换).
∴
(________________________________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2b4784ca73e0478d3ae08fd494a8f.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c613c8ea8b1abe76b803ae12316a8f9.png)
∴________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16acdcaac54dcfe8cc11accda9363987.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴____________(等量代换).
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2b4784ca73e0478d3ae08fd494a8f.png)
您最近一年使用:0次
10 . 请把下面证明过程补充完整:
已知:如图,
,
分别平分
,且
.
求证:
.
分别平分
(已知),
,
( ).
(已知),
(等量代换),
(已知),
(等量代换).
∴
( ).
,
( ).
( ).
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e3555cd6c109962fecba3a677c5286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7b50da9fef51f37b4813746d77a33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3f0bff977fd039f3fc3eb948872015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f421d57aeeab4b5cc3dfef87fa2741c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3f0bff977fd039f3fc3eb948872015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0332b8ee40be451e9affe3fc05416a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897e4b62b32f65075dc17081bacc226d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e3566b290df69bb5f10831037baf77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758dc5363d5b601cd457da948795f951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d98228bd5ecb89ef69c62a71f8e1ae6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b10ed511b90550169c0915873074d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b69cb1f880adf75d2290d599e858463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ee1b1ebb75ff0fc559548b8f102b6b.png)
您最近一年使用:0次