5-2 8\9+4\7
2 2\7+3 1\4-0.7

1)5-2=32)56/63+36/63=92/63

5-2 8\9+4\7= 45/9-26/9+4/7=19/9+4/7= 133/63+36/63=169/63=2цел 43/632 2\7+3 1\4-0.7=16/7+13/4-7/10= 64/28+91/28-7/10=155/28-7/10= 775/140-98/140=677/140= 4цел 117/140