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На рисунку оказана структурна група і сили, що діють на неї. Дано: FKO = 200 Н, G2 =100 Н, lAB= lBC= lВD =0.4м, lAS2= 0.5·lAB, <АВС =900. Завдання: визначити Rt12 in Н.
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