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初中数学“三叉口”几何模型——三线共点必旋转
初中数学“三叉口”几何模型——三线共点必旋转
初中数学合集31/138
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App12:12![[初中数学]定弦定角？截长补短？三线共点？四点共圆？有趣有趣](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/5e150fadc10c419983ebed1e5aae6afb~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=gPrRrbNTcj3nxL4nncdeuP0S1fE%3D)
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App06:44![[初中数学]双动点+费马点问题：求PA+PB+PE最小值](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/3a3ec9a64dff4192962576d44c0bfe0f~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=LKJq5WY%2BoVcWbliWUzVSEjRngXM%3D)
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App13:16![[初中数学]三角形的三条中线为什么交于一点，三角形重心问题](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/e72d1d1b61fb45a5a771e8eda80706af~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=T6idW61RzigHLHd7MbzoupANhH4%3D)
App06:44![[初中数学]“定弦定角”+平行四边形，作完辅助线一目了然！](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/b7621026d7484fc38e24fa9b303f12c4~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=rn3SOr5vJ99TlFxuv91JQjLaa9U%3D)
App05:09![[初中数学]那道瓜豆原理的题目居然可以用手拉手模型秒杀](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/19317f22f98c476e935fedcb5458018e~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=e%2Fkn%2BuC0GQv%2FCOc4oMSx4oK0OcU%3D)
App05:10![[初中数学]四点共圆+角平分线，这道题这样做感觉好极了！](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/232d744684bb4116a6132d804c1f059c~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=qI98lKwhFx3KF08nxd733vY9YUA%3D)
App08:27![[中考数学]平面几何''胖瘦模型''，辅助线很重要！](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/260e312ede754f5386716dc18d1ca8f9~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=NdtsP8Sn6mo23bKhlVI1JlIHR2o%3D)
App10:49![[初中数学]坐标系中的瓜豆原理——旋转相似很重要](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/951bf6d3f0a140229b1766a0a2b48f90~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=CjMhzsO%2Ft%2FmobJy%2Bc%2BEFGetCt5k%3D)
App09:51![[初中数学]四点共圆都会了，九点共圆还远吗？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/e93acc6cb59e4a8ca3bd0dce45350d78~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=75qrxPRjWeUUT90QWsI6sVjbKZc%3D)
App07:33![[初中数学]平面几何建系法VS纯几何法，选哪个？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/b2b066d648b84fd0bd7b34bb4bcc634a~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=BnzenfM25k4gmXZaMKCXMalJWH4%3D)
App14:25![[初中数学]最小值求多了，来求一下线段最大值吧](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/a3bb87c498e64f4f99bb9389a95e6d41~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=tRx3tIakVyQxVml9seV%2F8aSowos%3D)
App05:10![[初中数学]求k·PA+PB+PC的最小值，加权费马点问题](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/89b3edd73d3342e3ac963769651a37f3~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=xH4ebge0CD9U2bteABzQzcZk3OA%3D)
App06:53![[初中数学]圆周角定理中的2倍关系怎么证明？](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/2053807c1e094d90b551c7967a4d8b9e~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=Z3CxKxro3z61pH0Yi3hJTBNR2F4%3D)
App06:50![[初中数学]费马点难题警告：求3PA+4PB+5PC最小值](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/534a32ebd98c437f9144e9bf2c93d221~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=FtMgk1a146jtiW7cjhKUCwt12Ww%3D)
App09:53![[初中数学]全军覆没的一道最值问题，构造将军饮马很重要！](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/5619ac96344145d9a22aff820dee75ed~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=wWH2MXVdSEXZycopG0HYOh16IRk%3D)
App10:08![[初中数学]垂径定理的正确打开方式，中考、高考中怎么用](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/2a75c80c7b5340a3a4d4b10fde34654c~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=wuM8DHaC395sghENEBY6CGsR%2BSo%3D)
App11:30![[初中数学]布罗卡尔点——等腰＋相似，原来如此，相似三角形](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/71a24bd5cb8049f299d8faaeb12a4767~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202411301316323A71F882D60D60DB7D6A&requestFrom=704&version_code=80402&x-expires=1764479792&x-signature=ikFIjUHKUL%2F4nji7e1BUJa1P4K4%3D)
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