二次曲线是高中数学的重要内容之一,涉及知识点多且知识面广,常与其他知识(方程、三角、函数等)彼此渗透,相互融合,是高考经典题型之一。二次曲线问题往往人手容易,但要善始善终,想获得正确完美的解答却不容易。笔者根据自己的教学实践,结合同学们在学习解析几何巾常见的几类症状,有针对性地加以诊断,从而提出解决之法。症状一、生搬硬套——忽视标准方程成立的前提条件 The conic is one of the important contents of high school mathematics. It involves more knowledge and more knowledge, and often permeates and integrates with other knowledge (equations, trigonometry, functions, etc.). The problem of conic curves is often man-friendly, but it is not easy to get the right answers right and the perfect. The author according to his own teaching practice, combined with the students in the analysis of several common geometric scar tissue symptoms, targeted to be diagnosed, and thus propose a solution. Symptoms A, apply mechanically - ignoring the prerequisite for the establishment of standard equations