Respostas

2014-03-13T14:57:09-03:00
3x = x/2 + 10
6x/2 = x+20/2
6x - x = 20
5x = 20
x = 20/5
x = 4
2014-03-13T14:57:34-03:00
- O triplo de um numero = 3x;
- Sua metade: x/2, logo => 3x = (x/2 + 10) => 3x = (x+20)/2 => 2.3x = x + 20 =>
=> 6x = x + 20 => 6x - x = 20 => 5x = 20 => x = 20/5 => x = 4