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平面向量怎么秒杀数学竞赛题目，高考怎么选基底？
平面向量怎么秒杀数学竞赛题目，高考怎么选基底？
高中数学合集9/59
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App12:38![[高中数学]如何证明均值不等式？（居然可以用射影定理）](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/a98eacca0b46481496141c0430788a2f~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=2025050202092669412B4EFBBFCB0B83E3&requestFrom=704&version_code=80402&x-expires=1777658966&x-signature=hEpJS4ESOhNv4tBONU1as%2BYAVmE%3D)
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App08:58![[高中数学]二次函数实根分布的这道题目，你会做吗？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/71d2f44775c1482e82595f3bb1a3dfda~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=2025050202092669412B4EFBBFCB0B83E3&requestFrom=704&version_code=80402&x-expires=1777658966&x-signature=1ranUb4iiAEcz6uZ1bYjHgT2dZU%3D)
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App08:09![[高中数学]洛必达法则的正确打开方式：洛必达→洛必错！](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/0b8ed316528e40d6898bfe0f2bd97181~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=2025050202092669412B4EFBBFCB0B83E3&requestFrom=704&version_code=80402&x-expires=1777658966&x-signature=x0HUfgDp7TpML71huksCSwQl%2Fdw%3D)
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App11:19![[高中数学]圆锥曲线中的四点共圆和圆幂定理，斜率之和为0？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0004/1c946989ae604f34952e578927fc1b43~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=2025050202092669412B4EFBBFCB0B83E3&requestFrom=704&version_code=80402&x-expires=1777658966&x-signature=PF2Z2SY7eqM7eSnFIFUFrOOn5qA%3D)
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