Найдем координаты векторов:
- a + b = (3 + 0; -5 + 7; 2 + (-1)) = (3; 2; 1)
- a + c = (3 + 1/2; -5 + 3/2; 2 + 0) = (3.5; -3.5; 2)
- b + c = (0 + 1/2; 7 + 3/2; -1 + 0) = (0.5; 8.5; -1)
- d + b = (-2.7 + 0; 3.1 + 7; 0.5 + (-1)) = (-2.7; 10.1; -0.5)
- d + a = (-2.7 + 3; 3.1 + (-5); 0.5 + 2) = (0.3; -1.9; 2.5)
- a + b + c = (3.5; -2; 1)
- b + a + d = (0.3; 5.1; 1.5)
- a + b + c + d = (1; 12.1; 0.5)
Ответ: (3; 2; 1); (3.5; -3.5; 2); (0.5; 8.5; -1); (-2.7; 10.1; -0.5); (0.3; -1.9; 2.5); (3.5; -2; 1); (0.3; 5.1; 1.5); (1; 12.1; 0.5)