Respostas

2014-07-17T17:27:41-03:00
2/5 = 4/10 = 0,4

7/5= 14/10 = 1,4

50 = 2/5
x = 7/5
7.50/5 = 2/5x
70 = 2/5x
70/2/5 = x
70.5/2 = x
350/2 = x
175 = x