Respostas

A melhor resposta!
2014-05-12T20:51:00-03:00
(-7+2y-5z)+(-2x-7y+4z)
-7+2y-5z-2x-7y-4z
-2x+2y-7y-5z-4z-7
-2x-5y-9z-7
1 5 1