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通过解关于a,c的二元齐次不等式求离心率的范围例1已知F1,F2是椭圆的两个焦点,满足MF1·MF2=0的点M总在椭圆的内部,则椭圆离心率的取值范围是
By solving the bivariate homogeneous inequalities for a and c, the range of eccentricity is given. Example 1 It is known that F1 and F2 are the two focal points of the ellipse. The point M that satisfies MF1 · MF2 = 0 is always inside the ellipse. Then, the elliptical eccentricity The range of values is