Respostas

2014-02-24T12:49:43-03:00
X/x+1 + x/x+4 = 1  >  x(x+4) + x(x+1) = (x+1)(x+4)  >  x²+4x + x²+x = x² + 4x +x+4 > 2x²+5x = x² +5x+4 > 2x²-x²+5x-5x=4 > x² = 4 > x = raiz de 4 > x = 2
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