已知F1 F2是椭圆x^2/a^2+y^2/b^2=1(a>b>0)的两个焦点,P为椭圆上的一个点 且PF1垂直于PF2 若三角形PF1F2面积为9 ,求b?已知椭圆x^2/a^2+y^2/b^2=1(a>b>0)的右焦点为F,过F且斜率为 根号3/3 的直线交于 A B 两点,
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![已知F1 F2是椭圆x^2/a^2+y^2/b^2=1(a>b>0)的两个焦点,P为椭圆上的一个点 且PF1垂直于PF2 若三角形PF1F2面积为9 ,求b?已知椭圆x^2/a^2+y^2/b^2=1(a>b>0)的右焦点为F,过F且斜率为 根号3/3 的直线交于 A B 两点,](/uploads/image/z/9309359-47-9.jpg?t=%E5%B7%B2%E7%9F%A5F1+F2%E6%98%AF%E6%A4%AD%E5%9C%86x%5E2%2Fa%5E2%2By%5E2%2Fb%5E2%3D1%EF%BC%88a%3Eb%3E0%29%E7%9A%84%E4%B8%A4%E4%B8%AA%E7%84%A6%E7%82%B9%2CP%E4%B8%BA%E6%A4%AD%E5%9C%86%E4%B8%8A%E7%9A%84%E4%B8%80%E4%B8%AA%E7%82%B9+%E4%B8%94PF1%E5%9E%82%E7%9B%B4%E4%BA%8EPF2+%E8%8B%A5%E4%B8%89%E8%A7%92%E5%BD%A2PF1F2%E9%9D%A2%E7%A7%AF%E4%B8%BA9+%2C%E6%B1%82b%3F%E5%B7%B2%E7%9F%A5%E6%A4%AD%E5%9C%86x%5E2%2Fa%5E2%2By%5E2%2Fb%5E2%3D1%EF%BC%88a%3Eb%3E0%29%E7%9A%84%E5%8F%B3%E7%84%A6%E7%82%B9%E4%B8%BAF%2C%E8%BF%87F%E4%B8%94%E6%96%9C%E7%8E%87%E4%B8%BA+%E6%A0%B9%E5%8F%B73%2F3+%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%BA%A4%E4%BA%8E+A+B+%E4%B8%A4%E7%82%B9%2C)
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