Respuestas

2014-01-02T12:02:02+01:00
1) x-1/x+y*x+y/x=x-1/x
2) 2x-2/5y+5*y^2+2y+1/x^2-2x+1=2(x-1)/5(y+1)*(y+1)^2/(x-1)^2=2(y+1)/5(x-1)
3) 2(a+b)/a(a-b)*(a-b)^2/a+b=2(a-b)/a
4) m^2+m/m^2*3m-3/m^2-1=m(m+1)/m^2*3(m-1)/(m+1)(m-1)=3/m