Respostas

2014-08-19T20:47:20-03:00
13.1 ao quadrado + 8.2 - 4
13.1+8.2-4
13+8.2-4
13+16-4
29-4
25
2014-08-19T20:47:33-03:00
13(1)² +8(2) - 4

13 + 16 - 4 

13 + 12 = 25