Respostas

2013-09-24T22:36:23-03:00
5a + 3b - [5a - (a - 4b) - 5]
5a + 3b - [5a - a + 4b - 5]
5a + 3b - [4a + 4b - 5]
5a + 3b - 4a - 4b + 5
a - b + 5
1 5 1