已知P为椭圆x^2/25+y^2/16=1上的一点,M,N分别为圆(x+3)^2+y^2=1和圆(x-3)^2+y^2=4,|PM|+|PN|的最小值
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![已知P为椭圆x^2/25+y^2/16=1上的一点,M,N分别为圆(x+3)^2+y^2=1和圆(x-3)^2+y^2=4,|PM|+|PN|的最小值](/uploads/image/z/8617354-34-4.jpg?t=%E5%B7%B2%E7%9F%A5P%E4%B8%BA%E6%A4%AD%E5%9C%86x%5E2%2F25%2By%5E2%2F16%3D1%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CM%2CN%E5%88%86%E5%88%AB%E4%B8%BA%E5%9C%86%28x%2B3%29%5E2%2By%5E2%3D1%E5%92%8C%E5%9C%86%28x-3%29%5E2%2By%5E2%3D4%2C%7CPM%7C%2B%7CPN%7C%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC)
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