当实数a,b变化时,直线l1:(2a+b)x+(a+b)y+a-b=0与直线l2:m^2x+2y-n^2=0都过同一定点1.求出这个定点2.设点(m,n)的轨迹为曲线C,试求曲线C的焦点坐标
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![当实数a,b变化时,直线l1:(2a+b)x+(a+b)y+a-b=0与直线l2:m^2x+2y-n^2=0都过同一定点1.求出这个定点2.设点(m,n)的轨迹为曲线C,试求曲线C的焦点坐标](/uploads/image/z/7235569-1-9.jpg?t=%E5%BD%93%E5%AE%9E%E6%95%B0a%2Cb%E5%8F%98%E5%8C%96%E6%97%B6%2C%E7%9B%B4%E7%BA%BFl1%3A%282a%2Bb%29x%2B%28a%2Bb%29y%2Ba-b%3D0%E4%B8%8E%E7%9B%B4%E7%BA%BFl2%3Am%5E2x%2B2y-n%5E2%3D0%E9%83%BD%E8%BF%87%E5%90%8C%E4%B8%80%E5%AE%9A%E7%82%B91.%E6%B1%82%E5%87%BA%E8%BF%99%E4%B8%AA%E5%AE%9A%E7%82%B92.%E8%AE%BE%E7%82%B9%EF%BC%88m%2Cn%EF%BC%89%E7%9A%84%E8%BD%A8%E8%BF%B9%E4%B8%BA%E6%9B%B2%E7%BA%BFC%2C%E8%AF%95%E6%B1%82%E6%9B%B2%E7%BA%BFC%E7%9A%84%E7%84%A6%E7%82%B9%E5%9D%90%E6%A0%87)
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