Вычислить 4а - 3Б + 1/2с, если = (1;5),Б = (-2; 3), =3а (векторы)

4 * а – 3 * b + (1/2) * c. A(1; 5), 4 * a = (4; 20); B = (-2; 3), 3 * b = (-6; 9); C = 3 * a = (3; 15), (1/2) * c = (1,5; 7,5). 4 * a – 3 * b + (1/2) * c = (4 – (-6) + 1,5; 20 – 9 + 7,5) = (11,5; 18,5). Ответ: 4 * а – 3 * b + (1/2) * c = (11,5; 18,5).