Решите уравнение 1 целая 3/7*c+7/8=1 целая 3/8

10/7 c + 7/8 = 11/8
10/7 c = 11/8 - 7/8
10/7 c = 4/8
10/7 c = 1/2
c = 1/2 ÷ 10/7
c = 1/2 × 7/10
c = 7/20
c = 0,35

1 3/7 * с + 7/8 = 1 3/8

1 3/7с = 1 3/8 - 7/8 (1 3/8 - 7/8 = 11/8 - 7/8 = 4/8 = 1/2)

1 3/7с = 1/2

с = 1/2 : 1 3/7 (1/2 : 1 3/7 = 1/2 : 10/7 = 1/2 * 7/10 = 7/20)

с = 7/20