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3本の棒のトラス: 力 F_1, F_2, F_3 が F_1 + F_2 = 100 、、 を満たす。解け。
3本の棒のトラス: 力 F_1, F_2, F_3 が F_1 + F_2 = 100 、、 を満たす。解け。
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