Question

Va rog frumos ex 5.

Answer 1

$\rm E(x)=\Big(^{x)}3-\frac{1}{x}\Big):\frac{9x^2-1}{3x^2+x} \\ \\ E(x)=\Big(\frac{3x}{x}-\frac1x\Big)*\frac{x(3x+1)}{(3x+1)(3x-1)} \\ \\ E(x)=\frac{3x-1}{x}*\frac{x}{3x-1} \\ \\ \boxed{\rm E(x)=1}$

Answer 2

E(x)=(x)3−x1​):3x2+x9x2−1​E(x)=(x3x​−x1​):(3x+1)(3x−1)x(3x+1)​E(x)=x3x−1:3x−1x​E(x)=1​​