过抛物线Y=1/4X^2准线上一点做抛物线的两条切线,若切点分别为MN,则直线MN过定点( A(0,1) B(1,O) C(O,-1) D(-1,O)
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![过抛物线Y=1/4X^2准线上一点做抛物线的两条切线,若切点分别为MN,则直线MN过定点( A(0,1) B(1,O) C(O,-1) D(-1,O)](/uploads/image/z/2798288-8-8.jpg?t=%E8%BF%87%E6%8A%9B%E7%89%A9%E7%BA%BFY%3D1%2F4X%5E2%E5%87%86%E7%BA%BF%E4%B8%8A%E4%B8%80%E7%82%B9%E5%81%9A%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BF%2C%E8%8B%A5%E5%88%87%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAMN%2C%E5%88%99%E7%9B%B4%E7%BA%BFMN%E8%BF%87%E5%AE%9A%E7%82%B9%28+A%280%2C1%29+B%281%2CO%29+C%28O%2C-1%29+D%28-1%2CO%29)
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