解析几何是中学数学的重要内容之一 ,是历年高考屡见新题的板块 .解析几何的本质是用代数方法研究几何问题 .因此 ,数形结合是解析几何的重要特征 .学好解析几何要充分利用问题的几何性质 ,灵活运用代数知识 ,以使问题得到合理、简洁的解答 .例 1　如图 1 ,使抛物线 ｙ =ａｘ2 Analytic geometry is one of the important contents of middle school mathematics, and it is a plate that has hitherto hit new questions in the college entrance examination. The essence of analytical geometry is to use algebraic methods to study geometric problems. Therefore, the combination of numbers and shapes is an important feature of analytical geometry. Learn analytic geometry to be fully Using the geometric nature of the problem, the algebraic knowledge is used flexibly to make the problem a reasonable and concise solution. Example 1 As shown in Figure 1, the parabola y = ax2