Выполните действия:
2/9+5/18
17/20-5/12
11/15-3/10+1/45

2/9+5/18=4/18+5/18=9/18=1/217/20-5/12= 204/240-100/240=104/24011/15-3/10+1/4511/15-3/10=110/150-45/150=65/15065/150+1/45=2925/6750+150/6750=3075/675011/15-3/10+1/45=3075/6750