Question

Dau coroana
Se considera expresia :
E(x) = $( x^{}-1-$- $\frac{ x^{2} -1}{x+2}$) :$\frac{x-1}{x+2}$

Answer 1

E(x) =[ (x-1)(x+2) - (x²-1)]/ (x+2) * (x+2)/(x-1)
E(x) = (x²+2x-x-2-x²+1)/(x+2) * (x+2)/(x-1)
E(x) = (x-1)/(x+2) * (x+2)/(x-1)
E(x) = 1