Respostas

2013-10-03T13:19:34-03:00
X + 3*{ 9 + 3*[2-5*(8:4)]}
x + 3*{9 + 3*[2-5*2]}
x+3*{9+3*[2-10]}
x+3*{9+3*(-8)}
x+3*{9-24}
x+3*(-15)
x-45
x=45