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范围，是圆锥曲线的一个简单而重要的几何性质：椭圆ｘ２ａ２＋ｙ２ｂ２＝１（ａ＞ｂ＞０）的范围是｜ｘ｜≤ａ，｜ｙ｜≤ｂ；双曲线ｘ２ａ２－ｙ２ｂ２＝１（ａ＞０，ｂ＞０）的范围是｜ｘ｜≥ａ；抛物线ｙ２＝２ｐｘ（ｐ＞０）的范围是ｘ≥０．教学中我们发现，许多学生...
The range is a simple and important geometric property of the conic section: the range of the ellipse x2a2+y2b2=1 (a>b>0) is |x|≤a, |y|≤b; the hyperbola x2a2-y2b2=1(a> The range of 0, b>0) is |x|≥a; the range of parabola y2=2px (p>0) is x≥0. In teaching we found that many students...