СРОЧНО дам 60 баллов
решите пример
4/5+7/8•3/19: 6/6

1)7/8*3/19 = 21/152

2)21/152:6/6 = 21/152*6/6  = 21/152 * 1 = 21/152

3)4/5 + 21/152 = 608/760 + 105/760 = 713/760