已知椭圆 x^2/9+y^2=1,过左焦点F作倾斜角为30度的直线交椭圆于A,B两点求弦AB的长?这道题我知道a^2=9,b^2=1,c^2=8.“过左焦点F作倾斜角为30度的直线交椭圆于A,B两点”这一条直线是向左倾还是向右倾
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![已知椭圆 x^2/9+y^2=1,过左焦点F作倾斜角为30度的直线交椭圆于A,B两点求弦AB的长?这道题我知道a^2=9,b^2=1,c^2=8.“过左焦点F作倾斜角为30度的直线交椭圆于A,B两点”这一条直线是向左倾还是向右倾](/uploads/image/z/14533898-50-8.jpg?t=%E5%B7%B2%E7%9F%A5%E6%A4%AD%E5%9C%86+x%5E2%2F9%2By%5E2%3D1%2C%E8%BF%87%E5%B7%A6%E7%84%A6%E7%82%B9F%E4%BD%9C%E5%80%BE%E6%96%9C%E8%A7%92%E4%B8%BA30%E5%BA%A6%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%BA%A4%E6%A4%AD%E5%9C%86%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%E6%B1%82%E5%BC%A6AB%E7%9A%84%E9%95%BF%3F%E8%BF%99%E9%81%93%E9%A2%98%E6%88%91%E7%9F%A5%E9%81%93a%5E2%3D9%2Cb%5E2%3D1%2Cc%5E2%3D8.%E2%80%9C%E8%BF%87%E5%B7%A6%E7%84%A6%E7%82%B9F%E4%BD%9C%E5%80%BE%E6%96%9C%E8%A7%92%E4%B8%BA30%E5%BA%A6%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%BA%A4%E6%A4%AD%E5%9C%86%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%E2%80%9D%E8%BF%99%E4%B8%80%E6%9D%A1%E7%9B%B4%E7%BA%BF%E6%98%AF%E5%90%91%E5%B7%A6%E5%80%BE%E8%BF%98%E6%98%AF%E5%90%91%E5%8F%B3%E5%80%BE)
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