Respostas

2014-08-13T17:51:01-03:00
10ab - [3ab - (ab + 2ab - 5ab) - 8ab]
10ab - [3ab - (3ab - 5ab) - 8ab]
10ab - [3ab - ( - 2ab) - 8ab]
10ab - [3ab + 2ab - 8ab]
10ab - [5ab - 8ab]
10ab - [ - 3ab]
10ab + 3ab
= 13ab
3 3 3