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삼각형 A = (0,0) , B = (4,0) , C = (2, 3) . , , 를 계산하고 합이 0임을 보여라
삼각형 A = (0,0) , B = (4,0) , C = (2, 3) . , , 를 계산하고 합이 0임을 보여라
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