{"ops":[{"insert":"先看一道幾何題吧\n"},{"attributes":{"class":"normal-img"},"insert":{"native-image":{"alt":"read-normal-img","url":"https://b1.sanwen.net/b_article/f78e3dcf2adb508ecb7904798752fa5b831953fb.jpg","width":2026,"height":383,"size":129158,"status":"loaded"}}},{"insert":"（H點是垂心?。。。。。。‐n題目不是很難，主要為講解思路\n可以先自己做一做\n\n\n\n\n\n\n\n\n\n\n\n先看傳統(tǒng)幾何法吧\n"},{"attributes":{"class":"normal-img"},"insert":{"native-image":{"alt":"read-normal-img","url":"https://b1.sanwen.net/b_article/1ece8375a7e786c5b2f47bc1d2d0fef1eea34ce7.jpg","width":2026,"height":1113,"size":553752,"status":"loaded"}}},{"insert":"眾所周知，幾何法優(yōu)勢在于直觀簡潔，計算量小，但缺點就在于思路比較難想\n相比起來解析法思路更為自然\n下面看看點幾何法（向量法）\n"},{"attributes":{"class":"normal-img"},"insert":{"native-image":{"alt":"read-normal-img","url":"https://b1.sanwen.net/b_article/6718ec56c5691fa3777df050b7676aba9c25a5c1.jpg","width":2025,"height":641,"size":372082,"status":"loaded"}}},{"insert":"\n"},{"attributes":{"class":"normal-img"},"insert":{"native-image":{"alt":"read-normal-img","url":"https://b1.sanwen.net/b_article/e2addd14e5c40749032ee51540e9b40abad57b98.jpg","width":980,"height":358,"size":146007,"status":"loaded"}}},{"insert":"上述證明使用的是恒等式證明法，不清楚的可以看看我的專欄\n但是使用恒等式證明是有可能構造不出恒等式的，其原因是因為可能對原有幾何條件翻譯不到位\n下面我們再看看另一種恒等式證明\n"},{"attributes":{"class":"normal-img"},"insert":{"native-image":{"alt":"read-normal-img","url":"https://b1.sanwen.net/b_article/b7b961e331394e756e7ba7cb2272b9c00e0c6d8f.jpg","width":1426,"height":1258,"size":496836,"status":"loaded"}}},{"insert":"\n其中本人有個小想法，或許最終的線性方程組不一定要解，而是只要證明其解的存在性即可，即可比較其系數(shù)矩陣與增廣矩陣的秩\n這樣亦可證明原題\n\n"}]}