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八、解析几何（二）１．若ｋ为小于零的常数，则方程ｘ２ｋ＋ｙ２１－ｋ＝１的曲线是（）（Ａ）焦点在ｙ轴上的椭圆．（Ｂ）焦点在ｙ轴上的双曲线．（Ｃ）焦点在ｘ轴上的椭圆．（Ｄ）焦点在ｘ轴上的双曲线．２．双曲线ｘ２－ｙ２＝１的离心率ｅ等于（）（Ａ）３．（Ｂ）２...
Eight, analytical geometry (two) 1. If k is a constant less than zero, the curve of the equation x2k+y21-k=1 is () (A) the ellipse with focus on the y-axis. (B) Hyperbola with focus on the y-axis. (C) Ellipse with focus on the x-axis. (D) Hyperbola with focus on the x-axis. 2. The eccentricity e of the hyperbolic x2-y2=1 is equal to ()(A)3. (B)2...