过焦点弦端点的切线互相垂直并且交点在准线上,这个要怎么证明? 知乎 Template




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Try and sketch some of theseBolo tie, Gyroscope, Harpsichord, Spy, Office, Basket, Swimming pool, Splinter, Ticket, Dunce, view more ideas


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tomski过焦点弦端点的切线互相垂直并且交点在准线上,这个要怎么证明? 知乎 coloring