Răspunsuri

2014-04-15T20:57:16+03:00
E(x)=[1/(x+1)+x/(1-x)]:(x²+1)/(x²+x) in paranteza mare prima fractie o amplificam cu(1-x) iar a doua fractie cu x+1
      =[(1-x+x²+x)/(x+1)(1-x)]·(x²+x)/(x²+1)
      =[(x²+1)/(x+1)(1-x)]·x(x+1)/(x²+1) simplificam
      =x/(1-x)