已知A,B,C均在椭圆M:x^2/a^2+y^2=1(a>1)上,直线AB,AC分别过椭圆的左右焦点F1,F2当,已知A B C均在椭圆M:x^2/a^2+y^2=1(a>0)上 直线AB AC分别过椭圆的左右焦点F1 F2 ,当向量AC·向量F1F2=0时,有9向量AF1·向量AF2=向
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![已知A,B,C均在椭圆M:x^2/a^2+y^2=1(a>1)上,直线AB,AC分别过椭圆的左右焦点F1,F2当,已知A B C均在椭圆M:x^2/a^2+y^2=1(a>0)上 直线AB AC分别过椭圆的左右焦点F1 F2 ,当向量AC·向量F1F2=0时,有9向量AF1·向量AF2=向](/uploads/image/z/1756148-68-8.jpg?t=%E5%B7%B2%E7%9F%A5A%2CB%2CC%E5%9D%87%E5%9C%A8%E6%A4%AD%E5%9C%86M%3Ax%5E2%2Fa%5E2%2By%5E2%3D1%28a%3E1%29%E4%B8%8A%2C%E7%9B%B4%E7%BA%BFAB%2CAC%E5%88%86%E5%88%AB%E8%BF%87%E6%A4%AD%E5%9C%86%E7%9A%84%E5%B7%A6%E5%8F%B3%E7%84%A6%E7%82%B9F1%2CF2%E5%BD%93%2C%E5%B7%B2%E7%9F%A5A+B+C%E5%9D%87%E5%9C%A8%E6%A4%AD%E5%9C%86M%3Ax%5E2%2Fa%5E2%2By%5E2%3D1%28a%3E0%29%E4%B8%8A+%E7%9B%B4%E7%BA%BFAB+AC%E5%88%86%E5%88%AB%E8%BF%87%E6%A4%AD%E5%9C%86%E7%9A%84%E5%B7%A6%E5%8F%B3%E7%84%A6%E7%82%B9F1+F2+%2C%E5%BD%93%E5%90%91%E9%87%8FAC%C2%B7%E5%90%91%E9%87%8FF1F2%3D0%E6%97%B6%2C%E6%9C%899%E5%90%91%E9%87%8FAF1%C2%B7%E5%90%91%E9%87%8FAF2%3D%E5%90%91)
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