вычитание смешенных дробей 2 1/3-1 1/2, 7 1/9/4 1/3, 6 1/4-3 2/5

1) 21/3 - 1 1/2 = 7 - 1 1/2 = 5 1/2

2) 7 1/9 - 4 1/3 = 7 1/9 - 4 3/9 = 6 10/9 - 4 3/9 = 2 7/9

3) 6 1/4 - 3 2/5 = 6 5/20 - 3 8/20 = 5 25/20 - 3 8/20 = 2 17/20