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首先,與直線2x+y =0相距√5/5的直線必然與直線2x+y =0平行,可設為直線2x+y+c =0,再根據平行線間距離公式d =|C1-C2|/√(A²;+B²;)知所求直線的參數c滿足|c|=1即c =1或c =-1從而所求直線為直線2x…
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