Вариант 1, задание 2.

a) 14 · x = 112 ⟹ x = 112 : 14 = 8; b) 133 : y = 19 ⟹ y = 133 : 19 = 7; c) x : 15 = 19 ⟹ x = 19 · 15 = 285; d) (12 + y) · 15 = 225 ⟹ y = (225 : 15) - 12 = 3.