Răspunsuri

2014-11-14T00:02:23+02:00
A)  1/(3x-1) =(3x+1)/(3x-1)(3x+1)=(3x+1)/(9x²-1)
     1/(3x+1) =(3x-1)/(3x-1)(3x+1)=(3x-1)/(9x²-1)
b)  2/(2y+y²)=2/y(y+2)=2(y-2)/y(y²-4)
     4/(y²-4)=4/(y+2)(y-2)=4y/y(y²-4)
c)  x/(x²-4)=x/(x+2)(x-2)=x(x+2)/(x+2)²(x-2)
     2/(x²+4x+4)=2/(x+2)² =2(x-2)/(x+2)²(x-2)
     1/(x+2)=(x+2)(x-2)/(x+2)²(x-2)


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