1、椭圆x方/4+y方=1过动点A(4,m),做椭圆两条切线AP,AQ,切点分别为Q,P.证:直线PQ过定点,并求出定点坐标.2、an=(2^n)/[(2^n)+1]证a1+a2+……+an>n方/(n+1)
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![1、椭圆x方/4+y方=1过动点A(4,m),做椭圆两条切线AP,AQ,切点分别为Q,P.证:直线PQ过定点,并求出定点坐标.2、an=(2^n)/[(2^n)+1]证a1+a2+……+an>n方/(n+1)](/uploads/image/z/10400240-56-0.jpg?t=1%E3%80%81%E6%A4%AD%E5%9C%86x%E6%96%B9%2F4%2By%E6%96%B9%3D1%E8%BF%87%E5%8A%A8%E7%82%B9A%284%2Cm%29%2C%E5%81%9A%E6%A4%AD%E5%9C%86%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BFAP%2CAQ%2C%E5%88%87%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAQ%2CP.%E8%AF%81%EF%BC%9A%E7%9B%B4%E7%BA%BFPQ%E8%BF%87%E5%AE%9A%E7%82%B9%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E5%AE%9A%E7%82%B9%E5%9D%90%E6%A0%87.2%E3%80%81an%3D%282%5En%29%2F%5B%282%5En%29%2B1%5D%E8%AF%81a1%2Ba2%2B%E2%80%A6%E2%80%A6%2Ban%EF%BC%9En%E6%96%B9%2F%EF%BC%88n%2B1%EF%BC%89)
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