(1целая 1 /12+3,75)-(-x)=4,5

0,75 = 75/100 = 3/4 (сократили на 25)0,5 = 5/10 = 1/2 (сократили на 5)----------------------------------------------------(1 1/12 + 3,75) - (-х) = 4,51 1/12 + 3 3/4 + х = 4 1/21 1/12 + 3 9/12 + х = 4 1/24 10/12 + х = 4 1/2х = 4 1/2 - 4 10/12х = 4 3/6 - 4 5/6х = - (4 5/6 - 4 3/6)х = - 2/6х = - 1/3----------------------------Проверка: (1 1/12 + 3 3/4) - 1/3 = 4 10/12 - 1/3 = 4 5/6 - 2/6 = 4 3/6 = 4 1/2