一点(x0,y0),椭圆x²/a²+y²/b²=1 直线(x0*x)/a²+(y0*y)/b²=1点(x0,y0)在椭圆外时,(x0*x)/a²+(y0*y)/b²=1表示切点弦方程点(x0,y0)在椭圆上时,(x0*x)/a²+(y0*y)/b²=1
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 04:06:23
![一点(x0,y0),椭圆x²/a²+y²/b²=1 直线(x0*x)/a²+(y0*y)/b²=1点(x0,y0)在椭圆外时,(x0*x)/a²+(y0*y)/b²=1表示切点弦方程点(x0,y0)在椭圆上时,(x0*x)/a²+(y0*y)/b²=1](/uploads/image/z/10407554-26-4.jpg?t=%E4%B8%80%E7%82%B9%EF%BC%88x0%2Cy0%EF%BC%89%2C%E6%A4%AD%E5%9C%86x%26%23178%3B%2Fa%26%23178%3B%2By%26%23178%3B%2Fb%26%23178%3B%3D1+%E7%9B%B4%E7%BA%BF%28x0%2Ax%29%2Fa%26%23178%3B%2B%EF%BC%88y0%2Ay%EF%BC%89%2Fb%26%23178%3B%3D1%E7%82%B9%EF%BC%88x0%2Cy0%EF%BC%89%E5%9C%A8%E6%A4%AD%E5%9C%86%E5%A4%96%E6%97%B6%2C%28x0%2Ax%29%2Fa%26%23178%3B%2B%EF%BC%88y0%2Ay%EF%BC%89%2Fb%26%23178%3B%3D1%E8%A1%A8%E7%A4%BA%E5%88%87%E7%82%B9%E5%BC%A6%E6%96%B9%E7%A8%8B%E7%82%B9%EF%BC%88x0%2Cy0%EF%BC%89%E5%9C%A8%E6%A4%AD%E5%9C%86%E4%B8%8A%E6%97%B6%2C%28x0%2Ax%29%2Fa%26%23178%3B%2B%EF%BC%88y0%2Ay%EF%BC%89%2Fb%26%23178%3B%3D1)
xN@_ NVI
츖"@A+4!
H[ }93u+xʀDqu:͙S-St,<$)wДb[ݽ}wX/a:bWކGβ#P ·d
VbC;s jkR}c_?BmsAKG ˇ>w18Wô̜eE6t4dUAr{pVISPCF9D^S7p72DL]F/8";u^KwT3^Ok%Qkg6.+AT+Y C$P\=YB<5$qCoAK»%Bk*}:6{5IYO# qk
一点(x0,y0),椭圆x²/a²+y²/b²=1 直线(x0*x)/a²+(y0*y)/b²=1点(x0,y0)在椭圆外时,(x0*x)/a²+(y0*y)/b²=1表示切点弦方程点(x0,y0)在椭圆上时,(x0*x)/a²+(y0*y)/b²=1
一点(x0,y0),椭圆x²/a²+y²/b²=1 直线(x0*x)/a²+(y0*y)/b²=1
点(x0,y0)在椭圆外时,(x0*x)/a²+(y0*y)/b²=1表示切点弦方程
点(x0,y0)在椭圆上时,(x0*x)/a²+(y0*y)/b²=1表示切线方程
点(x0,y0)在椭圆内时,(x0*x)/a²+(y0*y)/b²=1表示什么?
一点(x0,y0),椭圆x²/a²+y²/b²=1 直线(x0*x)/a²+(y0*y)/b²=1点(x0,y0)在椭圆外时,(x0*x)/a²+(y0*y)/b²=1表示切点弦方程点(x0,y0)在椭圆上时,(x0*x)/a²+(y0*y)/b²=1
(x0,y0)在椭圆内时,过这一点任做一条弦AB,分别过A和B作切线,交于C,那么C的轨迹方程(是一条直线)就是(x0*x)/a²+(y0*y)/b²=1,称为(x0,y0)关于椭圆x²/a²+y²/b²=1的极线.
这里(x0,y0)不能是原点,否则就没意义了.
其实另外两种情况也叫极线,极线可以看成是切点弦的推广.