A)=x/x(x-1)=simplif cu x=1/(x-1)
b)= 2+x-x²(2+x)=(2+x)(1-x²)=(x+2)(1+x)(1-x)=(x+1)(x+2)(1-x)
c) E(x)={[x/x(x-1)]+[(x+2)/((2+x)-x²(2+x)]+[x²/x(x+1)]}·(x²-1)/x simplificam
E(x)={1/(x-1)]+[(x+2)/(x+2)(1-x²)]+[x/(x+1)}·(x²-1)/x simplif
E(x)={[1/(x-1)]-[1/(x²-1)]+[x/(x+1)]}·(x²-1)/x aducem paranteza la acelasi numitor
E(x)={[(x+1-1+x²-x)/(x²-1)]}·(x²-1)/x simplificm
E(x)=x²/x=x
