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离心率是描述圆锥曲线性质的一个重要概念.我们知道圆锥曲线的统一定义:到定点的距离与到定直线的距离的比是常数(记作e)的点的轨迹叫做圆锥曲线.其中常数e就是圆锥曲线的离心率,当01时为双曲线离心率;当e=1时为抛物线离心率.它可描述椭圆的扁圆程度、双曲线的开口大小.关于离心率问题,由上面可以看出:考查的重点是圆锥曲线离心率的求值,注重运算能力尤其字母运
Centrifugal rate is an important concept to describe the properties of conics. We know the unified definition of conic curve: the distance from the fixed point and the distance to the fixed line is constant (denoted as e) point trajectory is called conic. The constant e Is the concentric eccentricity of the cone, elliptic eccentricity for 0 1, and parabolic eccentricity for e = 1. It describes the degree of oval oblateness, The size of the opening curve.Considering the problem of eccentricity, it can be seen from the above: the focus of the test is the conic curve eccentricity evaluation, focusing on computing power, especially letters