瓜豆
https://www.bilibili.com/video/BV17m411X7DU
https://www.bilibili.com/video/BV1Vy4y177D7
https://www.bilibili.com/video/BV1Ja4y1N7Tk
https://www.bilibili.com/video/BV1BZ421Y7Fm
https://www.bilibili.com/video/BV1PG411T7n7
将军饮马
https://zhuanlan.zhihu.com/p/704119533
https://www.bilibili.com/video/BV1QK4y1a7nf
对偶（高中）
https://www.bilibili.com/video/BV1rRYiemECP
https://www.bilibili.com/video/BV15u4m1N7A3
https://www.bilibili.com/video/BV1ba411V7Ly
特值（高中）
https://www.bilibili.com/video/BV1vP4y1T7i6
不等式最值（高中）
https://www.bilibili.com/video/BV1sxHMeyECe
费马点
https://zhuanlan.zhihu.com/p/258312363
https://www.zhihu.com/question/284169703/answer/3196747483
https://zhuanlan.zhihu.com/p/511510278
https://zhuanlan.zhihu.com/p/481726051
https://zhuanlan.zhihu.com/p/79695396
https://zhuanlan.zhihu.com/p/345566047
https://zhuanlan.zhihu.com/p/136600079
加权费马
https://www.bilibili.com/video/BV1CUsjerELz
https://zhuanlan.zhihu.com/p/643753764
https://www.zhihu.com/question/342137175/answer/823316550
https://zhuanlan.zhihu.com/p/349484951
https://zhuanlan.zhihu.com/p/349256093
https://zhuanlan.zhihu.com/p/70489622
高中最值
https://zhuanlan.zhihu.com/p/631796275
https://mp.weixin.qq.com/s/Ipmj_HRhvlM89B7oXD9iNA
https://mp.weixin.qq.com/s/Ki9IlJbWXunjllMTLV4Jdg
中考几何模型
https://zhuanlan.zhihu.com/p/544889744
中考最值类型
https://zhuanlan.zhihu.com/p/672534564 （一题多解）
https://www.bilibili.com/video/BV1o84y1k7KY 有4p
https://www.bilibili.com/video/BV1a64y1T7US 有18p
https://zhuanlan.zhihu.com/p/369926366 习题
https://zhuanlan.zhihu.com/p/350629652
https://zhuanlan.zhihu.com/p/466174152
https://zhuanlan.zhihu.com/p/670273156
https://zhuanlan.zhihu.com/p/694009657
https://zhuanlan.zhihu.com/p/709085727
https://zhuanlan.zhihu.com/p/667525856