найди ошибки в решении и исправь их 

5 7/9+1 2/9=6 9/9=15

4 4/5+2 3/5=5 7/5=5 2/5

8-2 7/10=8 10/10-2 2 7/10=6 3/10

6 1/4-2 3/4= 5 4/4-2 3/4=3 1/4

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