Решить пример по ! 4/21+ ( 1 3/4- 11/12)- 5/14+ 1 2/3

1) 39/12-11/12=28/12=2 целых 4/12
2)28/3+16/3=44/3
3)2/3-5/14=28/42-15/42=13/42=1/4
4)13/42+12/3=13/42+168/42=281/42

1) 1 3/4-11/12=7/4-11/12=21/12-11/12=10/12=5/6
2) 4/21+5/6=8/42+35/42=43/42
3) 43/42-5/14=43/42-15/42=28/42=4/6
4) 4/6+1 2/3=4/6+5/3=4/6+10/6=14/6=7/3