设椭圆方程为x²/m²+y²/n²=1代入点坐标(9/25)/m²+16/n²=1(1)(16/25)/m²+9/n²=1(2)(1)+(2)1/m²+25/n²=21/m²=2-25/n²(3)(3)代入(1)9/25*(2-25/n²)+1...