Question

Помогите плизз!
5/6 + 5/18 - (3 целых 7/9 - 2 целых 13/15) = ?

Answer 1

5/6+5/18=20/18 или 1 2/18 или 1 1/9
3 7/9-2 13/15=41/45
1 1/19-41/45=20/19-41/45=121/855