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曲線M上の点から点F(1,0)までの距離は直線L:x+2=0までの距離よりも小さい1、すなわち曲線M上の点から点F(1,0)までの距離は直線L:x+1=0までの距離と等しい。 P/2=1P=2 y²=4x
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