Respostas

2013-06-13T20:08:54-03:00

x + 1/4x = 80 64 + 1/4 de 64

 

64/4 = 16

64 + 16 = 80

 

Logo x = 64

 

48 1 48
2013-06-13T20:23:37-03:00

x+x/4=80
(4x+x)/4=320/4
4x+x=320
5x=320
x=320/5
x=64

7 3 7