在等腰直角
中,
,
是射线
上一动点(不与
重合),作射线
,过点
作
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/0b558aa7-e29c-46d1-b09b-b0ac0bfebee5.png?resizew=256)
(1)如图1,当点
在线段
上时.
①求证:
;
②用等式表示
之间的等量关系,并证明.
(2)如图2,当点F在AC延长线上时,请直接用等式表示AG,BG,CG之间的等量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9262e02b1b62114f37e0134f2dbaa86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be23bcd995b65520577f9ffa6b761c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1f21901e4735a178589a9c1978743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/0b558aa7-e29c-46d1-b09b-b0ac0bfebee5.png?resizew=256)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ac64951c922a53961cb19bb47ace476.png)
②用等式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae8580423dc02e18f179706643d4c79.png)
(2)如图2,当点F在AC延长线上时,请直接用等式表示AG,BG,CG之间的等量关系.
更新时间:2022-11-12 09:58:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图1,线段
,
相交于点
,连接
,
,我们把形如图
的图形称为“
字形”.
(1)求证:
;
(2)如图2,求
的度数;
(3)如图3,
平分
,
平分
的邻补角
,试猜想
,
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/0965aef2-53e8-477c-8a02-0a508a256440.png?resizew=391)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86cd32cc39eef1bea07b6238644d803.png)
(2)如图2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dc92fc481bd2f4b2a468107f59ded5.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐2】如图,纸片上有
个不同的点(
,任意3个点不在同一直线上),探索
角星的角度和的规律.
(1)如图1,当
时,
______;
如图2,当
时,
______;
如图3,当
时,
______.
(2)①用含
的式子表示:
_______.
②当
时,
_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0a31b3956a520bbca0bbadefc90432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/0ba0aa6a-ba06-425d-b694-a468e81382e2.png?resizew=537)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cf86650443d1b86c79b1e3edc7e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92582a31062cd51ca1130c83299e143.png)
如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c345907ebe27888332b1b44c666cc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6113cb6d7d7883a87413b13cb52fbe85.png)
如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764eff906937f9b1fb58e5abfb2eb8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4056fe6b65f866f92a517870d89f1d0a.png)
(2)①用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b8c3711a58872a2624a13791d2d81d.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2521506a29dfa82b76370f6621b5e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a40828e6a9c9b39a9dc605a9e2599c.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】已知
是等边三角形,
.
(1)如图1,点
在线段
上从点
出发沿射线
以
的速度运动,过点
作
交线段
于点
,同时点
从点
出发沿
的延长线以
的速度运动,连接
、
.设点
的运动时间为
秒.
①求证:
是等边三角形;
②当点
不与点
、
重合时,求证:
.
(2)如图2,点
为
的中点,作直线
,点
为直线
上一点,连接
,将线段
绕点
逆时针旋转
得到
,则点
在直线
上运动的过程中,
的最小值是多少?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8b79e8117dbbe73418dce43aa08ba4.png)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a41e5ea76060e034d1241d0d9d4f29b.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017fd17fb8d628e52c611f8d074d939a.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23dd5d7bdfef4e4b39667dafab026b6.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d5ba423355565d1888cf72f40e917d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d5ba423355565d1888cf72f40e917d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236abcd5701f3d6d512f022a0f5abc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1ec05e3cec27677ded7b4aecaa62d3.png)
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420689113317376/2420926362746880/STEM/bfafa7dc6e0544d1bd50ee80ce9bd870.png?resizew=352)
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【推荐2】如图,点E,F在AB上,DF=BC,∠DFA=∠B,AE=BF.求证:AD∥EC.
![](https://img.xkw.com/dksih/QBM/2019/3/13/2159679324405760/2165875482714112/STEM/45c1da39d1844d7a882dc3046a3ca293.png?resizew=144)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,点E是
上一点,
和
分别平分
和
,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717225532203008/2785980761382912/STEM/6ac798c0-3b81-452b-a93c-c271189e8125.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc5653b8818c02e71dc54027b175256.png)
(2)求线段
的长度
(3)求平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d3ceb08a9b251ed989089bf50011d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717225532203008/2785980761382912/STEM/6ac798c0-3b81-452b-a93c-c271189e8125.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc5653b8818c02e71dc54027b175256.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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名校
【推荐2】[教材呈现]如图是华师版九年级上册数学教材第103页的部分内容.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/7532e314-856d-402d-98c4-85e99161aa18.png?resizew=382)
(1)请根据教材提示,结合图1,写出完整的证明过程.
(2)[结论应用]如图2,直角三角形
纸片中,
,点
是
边上的中点,连结
,将
沿
折叠,点
落在点
处,此时恰好有
.若
,那么
长为______.
(3)如图3,在
中,
是
边上的高线,
是
边上的中线,
是
的中点,
.若
,求
.
例2如图,在![]() ![]() ![]() ![]() 证明:延长 ![]() ![]() ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/7532e314-856d-402d-98c4-85e99161aa18.png?resizew=382)
(1)请根据教材提示,结合图1,写出完整的证明过程.
(2)[结论应用]如图2,直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c28be5dccf0a867ad905c3124d45277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8fb32ae05a9c1abd3374f5c5f7a999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa7cefa293103fd19896befdfed8ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fd46944816b0f7f7efa311613996ad.png)
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适中
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【推荐1】如图,在平面直角坐标系中,
,点B在x轴上,点C在y轴上,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/b067f3ad-6d42-4b79-a53f-335d045a1394.png?resizew=525)
(1)求点B的坐标;
(2)点P从点A出发沿着线段
以每秒2个单位长度运动,到B点停止运动,运动时间为t秒,连接
,
,
的面积为S,用含t的式子表示S(不用写t的取值范围);
(3)当P运动时间为2秒时,连接
,以P为直角顶点、
为直角边作等腰直角
,求D点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/b067f3ad-6d42-4b79-a53f-335d045a1394.png?resizew=525)
(1)求点B的坐标;
(2)点P从点A出发沿着线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cfa5651c2e3ddc9a59ef514714039c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e547cc9144ebdd6a415efb0794d651.png)
(3)当P运动时间为2秒时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc6b0f69ed7e3633248f6b1c093e874.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,
为边
上的点,且
,过点
作
,过点
作
,且
、
相交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://img.xkw.com/dksih/QBM/2023/1/29/3163136326475776/3163787333296128/STEM/aac2be7d4c6e4054b7452194eb31628a.png?resizew=269)
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解答题-问答题
|
适中
(0.65)
【推荐3】常见的分解因式的方法有提公因式法、公式法及十字相乘法,而有的多项式既没有公因式,也不能直接运用公式分解因式,但是某些项通过适当的调整能构成可分解的一组,用分组来分解一个多项式的因式,这种方法叫分组分解法.如x2+2xy+y2﹣16,我们细心观察这个式子就会发现,前三项符合完全平方公式,分解后与后面的部分结合起来又符合平方差公式,可以继续分解,过程为:x2+2xy+y2﹣16=(x+y)2﹣42=(x+y+4)(x+y﹣4).它并不是一种独立的因式分解的方法,而是为提公因式或运用公式分解因式创造条件.阅读材料并解答下列问题:
(1)分解因式:2a2﹣8a+8;
(2)请尝试用上面的方法分解因式:x2﹣y2+3x﹣3y;
(3)若△ABC的三边a,b,c满足a2﹣ab﹣ac+bc=0,请判断△ABC的形状并加以说明.
(1)分解因式:2a2﹣8a+8;
(2)请尝试用上面的方法分解因式:x2﹣y2+3x﹣3y;
(3)若△ABC的三边a,b,c满足a2﹣ab﹣ac+bc=0,请判断△ABC的形状并加以说明.
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