已知直线l:3x-4y+12=0分别与x,y轴交于A,B两点求①以A点为焦点,以B为顶点的椭圆方程②若过A且垂直于x轴的直线交椭圆于PQ,求PQ的长
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![已知直线l:3x-4y+12=0分别与x,y轴交于A,B两点求①以A点为焦点,以B为顶点的椭圆方程②若过A且垂直于x轴的直线交椭圆于PQ,求PQ的长](/uploads/image/z/10476519-15-9.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%EF%BC%9A3x-4y%2B12%3D0%E5%88%86%E5%88%AB%E4%B8%8Ex%2Cy%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%E6%B1%82%E2%91%A0%E4%BB%A5A%E7%82%B9%E4%B8%BA%E7%84%A6%E7%82%B9%2C%E4%BB%A5B%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E6%A4%AD%E5%9C%86%E6%96%B9%E7%A8%8B%E2%91%A1%E8%8B%A5%E8%BF%87A%E4%B8%94%E5%9E%82%E7%9B%B4%E4%BA%8Ex%E8%BD%B4%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%BA%A4%E6%A4%AD%E5%9C%86%E4%BA%8EPQ%2C%E6%B1%82PQ%E7%9A%84%E9%95%BF)
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