关于圆锥曲线中的相交弦有三种常见的表现形式,即两弦相交成直角、两相交弦倾斜角互补、三弦组成特殊的三角形．下面分类举例,阐述常用的求解策略,供参考．一、两弦相交成直角例1已知椭圆x2/a2+y2/b2=1(a>b>0)与x轴正方向交于点A,若这个椭圆上有点P,使∠OPA=90°(O为原点),求椭圆离心率的范 There are three common manifestations of the intersecting strings in the conic section: the two strings intersect at right angles, the two intersecting strings have complementary angles, and the three strings form a special triangle. The following classification examples illustrate common solution strategies for reference. One or two chords intersect at right angles. Example 1 The known ellipse x2/a2+y2/b2=1 (a>b>0) intersects with the positive direction of the x-axis at point A. If this ellipse is a little P, make ∠OPA=90. ° (O is the origin), to find the elliptic eccentricity