Г) х- 3/7 = 4/21 д) 4/5 - х = 1/6 е) 5/8 - х = 1/3
х= 4/21 + 3/7 х= 4/5 -1/6 х= 5/8 - 1/3
х= 4/21 + 9/21 х= 24/30 - 5/30 х= 15/24 - 8/24
х= 13/21 х= 19/30 х= 7/24
Проверка
13/21 - 3/7 = 4/21 4/5 - 19/30 = 1/6 5/8 - 7/24 = 1/3
13/21 - 9/21 = 4/21 24/30 - 19/30 = 1/6 15/24 - 7/24 = 1/3
4/21 = 4/21 5/30 = 1/6 8/24 = 1/3
1/6 = 1/6 1/3 = 1/3