(1)与双曲线x²/9-y²=1有相同的渐进线的双曲线的标准方程是:A.y²/4-x²/36=1 B.x²/4-y²/36=1 C.y²/18-X²/2=1 D.x²/2-y²/18=1(2)方程x²+y²sina=1,a属于(-π/2,0)表示的曲
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![(1)与双曲线x²/9-y²=1有相同的渐进线的双曲线的标准方程是:A.y²/4-x²/36=1 B.x²/4-y²/36=1 C.y²/18-X²/2=1 D.x²/2-y²/18=1(2)方程x²+y²sina=1,a属于(-π/2,0)表示的曲](/uploads/image/z/3760810-34-0.jpg?t=%281%29%E4%B8%8E%E5%8F%8C%E6%9B%B2%E7%BA%BFx%26%23178%3B%2F9-y%26%23178%3B%3D1%E6%9C%89%E7%9B%B8%E5%90%8C%E7%9A%84%E6%B8%90%E8%BF%9B%E7%BA%BF%E7%9A%84%E5%8F%8C%E6%9B%B2%E7%BA%BF%E7%9A%84%E6%A0%87%E5%87%86%E6%96%B9%E7%A8%8B%E6%98%AF%EF%BC%9AA.y%26%23178%3B%2F4-x%26%23178%3B%2F36%3D1+B.x%26%23178%3B%2F4-y%26%23178%3B%2F36%3D1+C.y%26%23178%3B%2F18-X%26%23178%3B%2F2%3D1+D.x%26%23178%3B%2F2-y%26%23178%3B%2F18%3D1%282%29%E6%96%B9%E7%A8%8Bx%26%23178%3B%2By%26%23178%3Bsina%3D1%2Ca%E5%B1%9E%E4%BA%8E%EF%BC%88-%CF%80%2F2%2C0%EF%BC%89%E8%A1%A8%E7%A4%BA%E7%9A%84%E6%9B%B2)
(1)与双曲线x²/9-y²=1有相同的渐进线的双曲线的标准方程是:A.y²/4-x²/36=1 B.x²/4-y²/36=1 C.y²/18-X²/2=1 D.x²/2-y²/18=1(2)方程x²+y²sina=1,a属于(-π/2,0)表示的曲
(1)与双曲线x²/9-y²=1有相同的渐进线的双曲线的标准方程是:
A.y²/4-x²/36=1 B.x²/4-y²/36=1 C.y²/18-X²/2=1 D.x²/2-y²/18=1
(2)方程x²+y²sina=1,a属于(-π/2,0)表示的曲线是圆、椭圆、双曲线、抛物线?
麻烦细写指教.
(1)与双曲线x²/9-y²=1有相同的渐进线的双曲线的标准方程是:A.y²/4-x²/36=1 B.x²/4-y²/36=1 C.y²/18-X²/2=1 D.x²/2-y²/18=1(2)方程x²+y²sina=1,a属于(-π/2,0)表示的曲
搞清基本概念即可
x^2/a^2-y^2/b^2=1 的渐近线方程为 y=±bx/a
y^2/a^2 -x^2/b^2=1 渐近线方程为 y = ±ax/b
x²/9-y²=1 渐近线方程为 y = ±x/3; 只有A符合题意
a属于(-π/2,0) 可知 00 这是一个椭圆,焦点在y轴上