Y=2ab-c. a=2;b=6;c=-1
Y = 2 × a × b - c; a = 2, b = 6, c = -1, y = 2 * 2 * 6 - (-1), y = 4 * 6 - (-1), y = 4 * 6 + 1, y = 24 + 1, y = 25. Ответ: y = 25.