某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
【观察与猜想】(1)如图 1,在正方形
中,点 E、 F分别是
、
上的两点,连接
、
,
,则
的值为 ;
【类比探究】(2)如图 2 ,在矩形
中,
,点 E是
上的一点,连接
、
,且
,求
的值;
【拓展延伸】(3)如图3,在四边形
中,
,
,
,点E为
上一点,连接
,过点 C作
的垂线交
的延长线于点 G,交
的延长线于点 F,求
的值;
【观察与猜想】(1)如图 1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
【类比探究】(2)如图 2 ,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1983c41ebdacc818687e43642f8fb670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
【拓展延伸】(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341460754c235399e43a663404a8dba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8a8257c3e0ee20cd4626656af4af91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
更新时间:2024-02-24 12:18:34
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【推荐1】【教材呈现】如下是华师版八年级下册数学教材第75页练习的部分内容.证明结论的正确性.
如图①,如果直线
,那么
的面积和
的面积是相等的.
【方法探究】如图②,在
中,点
在边
上.若
,求
与
数量关系.
【方法应用】如图③,正方形
的边长为5,点
是正方形内部一点,连结
、
.当
是以
为腰的等腰三角形,且
时,直接写出
的长.
如图①,如果直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e03566282ef39ad17821036f228174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/ef4580dc-38bf-4276-8f87-d2920ca761ec.png?resizew=160)
【方法探究】如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c6784571d818982d8d3fe53410bc4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fde46381b6e7585b886c6cc8a16d94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/54f5a46e-fd2c-456d-8df6-c8e5c978fd62.png?resizew=169)
【方法应用】如图③,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851622d0f54862704576380e1d4a1967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/281ed7dc-04d4-4d8b-9484-2ab8c2d4282e.png?resizew=103)
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【推荐2】已知:如图,在矩形
和等腰
中,
,
,
.点P从点B出发,沿
方向匀速运动,速度为
;同时,点Q从点D出发,沿
方向匀速运动,速度为
.过点Q作
,交
于点H,交
于点M,过点Q作
,交
于点N分别连接
,
,设运动时间为
.解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458707484672/2980066821955584/STEM/e53d40e6-5b9b-4b7e-8699-0ce94b2815a9.png?resizew=230)
(1)当
时,求t的值;
(2)设五边形
的面积为
,求S与t之间的函数关系式;
(3)当
时,求t的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d110261e49b946b3e859ad0a8ba48a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e9869497f065d9eb112bca9c71a64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b311b96bd13604c52100c657d384047a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d273c3d98fb6077f4607ff651d503f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138d749f4d25b4ec42c268667ef51150.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458707484672/2980066821955584/STEM/e53d40e6-5b9b-4b7e-8699-0ce94b2815a9.png?resizew=230)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbdf8648ebbc56720ec14fd91159906.png)
(2)设五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2f1406d8b3316dbbe8349dd719a174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9091bc1886a3fd3d17160b2d41ded.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380fc832d2d53da00d1f21392b182f30.png)
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名校
【推荐1】已知在矩形
中,
,
.在
上取一点
,
,点
是
边上的一个动点,以
为一边作菱形
,使点
落在
边上,点
落在矩形
内或其边上.若
,
的面积为
.
是正方形时,求
的值;
(2)如图2,当四边形
是菱形时,求
与
的函数关系式;
(3)求当
为多少时,
最大;当
为多少时,
最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.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/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617345f55a92ef7e03e11a7f9f174e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39f31a107039ce5fdf44f6f33fc3744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)如图2,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】如图,在正方形
中,点M在边
上,点N在边
的延长线上,且
.点E为
的中点,
的延长线与
相交于点F.试猜想线段
与线段
的关系,并证你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f3175a979c2f908d6c5665e14894b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2018/6/11/1964848778510336/1967765899632640/STEM/89c3be27c575417c812d3cdae975f318.png?resizew=204)
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【推荐1】如图,点E在正方形
的内部,且
为等边三角形,
与
相交于点O,
的延长线交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/67c0fae0-07eb-44ed-a9fd-fe1ce37dae80.png?resizew=128)
(1)连接
,求证:
为等腰三角形;
(2)设正方形
的面积为S,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/67c0fae0-07eb-44ed-a9fd-fe1ce37dae80.png?resizew=128)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a6dd314d1514e6e0f0e298c1ef1b44.png)
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【推荐2】如图1,已知正方形ABCD,E是线段BC上一点,N是线段BC延长线上一点,以AE为边在直线BC的上方作正方形AEFG.
(1)连接GD,求证
;
(2)连接FC,求
的值;
(3)如图2,将图1中正方形ABCD改为矩形ABCD,
,
,E是线段BC上一动点(不含端点B,C),以AE为边在直线BC的上方作矩形AEFG,使顶点G恰好落在射线CD上.当点E由B向C运动时,判断
的值是否为定值?若是,求出该定值;若不是,请说明理由.
(1)连接GD,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bd13921ee733250e1a9e5b1f663e47.png)
(2)连接FC,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce261bec39286ec8e4599bed571f7d8.png)
(3)如图2,将图1中正方形ABCD改为矩形ABCD,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce261bec39286ec8e4599bed571f7d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/f549d042-f21f-4912-83a3-911ace56a34a.png?resizew=394)
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【推荐1】如图,将边长为15的正方形
置于直角坐标系中,
、
分别与x轴、y轴的正半轴重合,边长为
的等边
的边
垂直于x轴,
从点A与点O重合的位置开始,以每秒1个单位长的速度先向右平移,当
边与直线
重合时,继续以同样的速度向上平移,当点C与点F重合时,
停止移动.设运动时间为x秒,
的面积为y.
(1)当x为何值时,P、A、B三点在同一直线上,求出此时A点的坐标;
(2)在
向右平移的过程中,当x分别取何值时,y取最大值和最小值?最大值和最小值分别是多少?
(3)在
移动的过程中,请你就
面积大小的变化情况提出一个综合论断.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0340db63e48b48d5f6eafaa1a1955c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/75041aa2-555f-4577-8c47-337883e3564f.png?resizew=188)
(1)当x为何值时,P、A、B三点在同一直线上,求出此时A点的坐标;
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
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【推荐2】(1)如图1,已知
和
均为等边三角形,
在
上,
在
上,易得线段
和
的数量关系是 .
(2)将图1中的
绕点
旋转到图2的位置,直线
和直线
交于点
.
①判断线段
和
的数量关系,并证明你的结论;
②图2中
的度数是 .
(3)如图3,若
和
均为等腰直角三角形,
,
,
,直线
和直线
交于点
,分别写出
的度数,线段
、
间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dde34f35b41aa2e929fc5653c87815a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b506c24f554901249694f21d9621b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/5b1eeef4-4176-48ac-8d39-90cdbaa17e7c.png?resizew=539)
您最近一年使用:0次