Răspunsuri

2014-06-08T22:26:44+03:00
F(x)/x+1= (2x-4)/(x+1)

f(x+2)/(x-1)=  (2x-4+2)/(x-1)=  (2x-2)/(x-1)

(2x-4)/(x+1)= (2x-2)/(x-1)

(x-1)(2x-4)=(x+1)(2x-2)
2x²-4x-2x+4=2x²-2x+2x-2

2x²-6x+4=2x²-2

-6x+4=-2

-6x=-2-4
-6x=-6
x=1