如何证明椭圆外点f作直线交椭圆于pq椭圆外点h分别与pq连交椭圆于rs则rs过定点且定点在fh上 知乎 Template




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tomski如何证明椭圆外点f作直线交椭圆于pq椭圆外点h分别与pq连交椭圆于rs则rs过定点且定点在fh上 知乎 coloring