Архитектор2000

Verified answer

1 пример:
1)7/18-2/10=35/90-18/90=17/90
2)17/90+1/9=17/90+10/90=27/90=3/10

2пример:
1)8/15+7/20=32/60+21/60=53/60
2)53/60-47/100=265/300-141/300=124/300=31/75