Respostas

2013-08-26T14:39:32-03:00
0000000000000000000000000000
  

2013-08-26T14:39:52-03:00
X²-2.x.1+1²- x²+2.x.1+1² =
x²-2x+1-x²-2x-1=
resposta: -4x