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ID:59599760
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时间:2020-11-14
《椭圆的几何性质资料.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、椭圆的几何性质椭圆的范围即oxyx=-ax=ay=by=-b由-a≤x≤a,-b≤y≤b2021/7/282yxoF1F2··x2y2+=1a22b椭圆的对称性2021/7/283yxoF1F2··x2y2+=1a22b2021/7/284yxoF1F2··x2y2+=1a22b2021/7/285yxoF1F2··x2y2+=1a22b2021/7/286yxoF1F2··x2y2+=1a22b2021/7/287yxoF1F2··x2y2+=1a22b2021/7/288yxoF1F2··x2y2+=
2、1a22b2021/7/289yxoF1F2··x2y2+=1a22b2021/7/2810yxoF1F2··x2y2+=1a22b2021/7/2811yxoF1F2··x2y2+=1a22b2021/7/2812yxoF1F2··x2y2+=1a22b2021/7/2813yxoF1F2··x2y2+=1a22b2021/7/2814yxoF1F2··x2y2+=1a22b2021/7/2815yxoF1F2··x2y2+=1a22b2021/7/2816yxoF1F2··x2y2+=1a22b202
3、1/7/2817yxoF1F2··x2y2+=1a22b2021/7/2818yxoF1F2··x2y2+=1a22b2021/7/2819yxoF1F2··x2y2+=1a22b2021/7/2820yxoF1F2··x2y2+=1a22b2021/7/2821yxoF1F2··x2y2+=1a22b2021/7/2822yxoF1F2··x2y2+=1a22b2021/7/2823yxoF1F2··x2y2+=1a22b2021/7/2824yxoF1F2··x2y2+=1a22b2021/7/282
4、5yxoF1F2··x2y2+=1a22b2021/7/2826yxoF1F2··x2y2+=1a22b2021/7/2827yxoF1F2··x2y2+=1a22b2021/7/2828yxoF1F2··x2y2+=1a22b2021/7/2829yxoF1F2··x2y2+=1a22b2021/7/2830yxoF1F2··x2y2+=1a22b2021/7/2831yxoF1F2··x2y2+=1a22b2021/7/2832yxoF1F2··x2y2+=1a22b2021/7/2833yxoF1F
5、2··x2y2+=1a22b2021/7/2834yxoF1F2··x2y2+=1a22b2021/7/2835yxoF1F2··x2y2+=1a22b2021/7/2836yxoF1F2··x2y2+=1a22b2021/7/2837yxoF1F2··x2y2+=1a22b2021/7/2838yxoF1F2··x2y2+=1a22b2021/7/2839yxoF1F2··x2y2+=1a22b2021/7/2840yxoF1F2··x2y2+=1a22b2021/7/2841yxoF1F2··x2y2
6、+=1a22b2021/7/2842yxoF1F2··x2y2+=1a22b2021/7/2843yxoF1F2··x2y2+=1a22b2021/7/2844yxoF1F2··x2y2+=1a22b2021/7/2845yxoF1F2··x2y2+=1a22b2021/7/2846yxoF1F2··x2y2+=1a22b2021/7/2847yxoF1F2··x2y2+=1a22b2021/7/2848yxoF1F2··x2y2+=1a22b2021/7/2849yxoF1F2··x2y2+=1a22b
7、2021/7/2850yxoF1F2··x2y2+=1a22b2021/7/2851yxoF1F2··x2y2+=1a22b2021/7/2852yxoF1F2··x2y2+=1a22b2021/7/2853yxoF1F2··x2y2+=1a22b2021/7/2854YXOP(x,y)P2(-x,y)P3(-x,-y)P1(x,-y)关于x轴对称关于y轴对称关于原点对称2021/7/2855四、椭圆的离心率叫做椭圆的离心率。[1]离心率的取值范围:[2]离心率对椭圆形状的影响:1)e越接近1,c就越接近
8、a,b就越小,此时椭圆就越扁。2)e越接近0,c就越接近0,b就越大,此时椭圆就越趋近于圆。离心率反映椭圆的圆扁程度离心率:因为a>c>0,所以0
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