很多时候,解析几何解答题因其计算繁琐而令学生望而生畏.设P(x_1,y_1),Q(x_2,y_2)是直线与圆锥曲线的两个交点,有一类涉及到或者能转化为形如s(x_1+m)(x_2+m)+t(x_1+n)(x_2+n)的计算问题,通常是将其展开整理成p(x_1+x_2)+qx_1x_2+r的形式再利用韦达定理来求解.事实上,作为传统方法的改进,也可以采取赋 In most cases, P (x_1, y_1), Q (x_2, y_2) are the two intersections of a straight line and a conic. One type involves or can be transformed into a shape like The calculation of s (x_1 + m) (x_2 + m) + t (x_1 + n) (x_2 + n) is usually solved by expanding it into a form of p (x_1 + x_2) + qx_1x_2 + r Theorem to solve. In fact, as an improvement of the traditional method, you can also take the Fu