一“五步法”是求曲线方程的基本方法所谓基本方法,就是现行中学教材基本要求中的方法。“五步法”是求曲线方程的基本方法。先从例题中看“五步法”是哪五步。例1 求过定点M(1,2),离心率为1/2,且以y轴为准线的椭圆的左焦点F的轨迹方程。 A “five-step method” is the basic method for finding the basic equations of the curve equation. It is the method in the basic requirements of the current middle school textbooks. The “five-step method” is the basic method for finding the curve equation. First of all, look at the five examples of the “five-step method”. Example 1 The trajectory equation of the left focus F of the ellipse with the fixed point M(1,2), the eccentricity of 1/2, and the y-axis as the alignment line was obtained.