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3개 막대 트러스: 힘 F_1, F_2, F_3 가 F_1 + F_2 = 100 , , 을 만족. 풀어라
3개 막대 트러스: 힘 F_1, F_2, F_3 가 F_1 + F_2 = 100 , , 을 만족. 풀어라
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