已知曲线方程x²/9-k+y²/k-4=1 (1)当双曲线为椭圆时,k的取值范围?
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![已知曲线方程x²/9-k+y²/k-4=1 (1)当双曲线为椭圆时,k的取值范围?](/uploads/image/z/1078693-61-3.jpg?t=%E5%B7%B2%E7%9F%A5%E6%9B%B2%E7%BA%BF%E6%96%B9%E7%A8%8Bx%26%23178%3B%2F9-k%2By%26%23178%3B%2Fk-4%3D1+%281%29%E5%BD%93%E5%8F%8C%E6%9B%B2%E7%BA%BF%E4%B8%BA%E6%A4%AD%E5%9C%86%E6%97%B6%2Ck%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3F)
已知曲线方程x²/9-k+y²/k-4=1 (1)当双曲线为椭圆时,k的取值范围?
已知曲线方程x²/9-k+y²/k-4=1 (1)当双曲线为椭圆时,k的取值范围?
已知曲线方程x²/9-k+y²/k-4=1 (1)当双曲线为椭圆时,k的取值范围?
当9-k>0,k-4>0且9-k不=K-4时为椭圆.即有:
4
k-4>0且不等于9