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設P(x,y) 因為P到直線2x+y+5=0的距離與原點到這條直線的距離相等 所以 | 2x+y+5 |=5又因為p為直線4X-Y-1=0上一點 所以y=4x-1 所以{x=1/6 y=-1/3} { x=-3/2 y=-7}
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