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Точки A(1; 3; -1), B(2; 1; 2), C(1; -2; 1) є вершинами паралелограма ABCD. Знайд...
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Точки A(1; 3; -1), B(2; 1; 2), C(1; -2; 1) є вершинами паралелограма ABCD. Знайдіть координати вершини D
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