Question

Ex 5 va rog frumos. Dau coronita

Answer 1

Ai aici rezolvarea.

spor:)

Answer 2

Răspuns:

Explicație pas cu pas:

$E(x)=[1-2\frac{x-1}{x+1 } +(\frac{x-1}{x+1} )^{2}]\frac{(x-1)(x+1)}{4} =(\frac{x-1}{x+1}-1 ) ^{2} \frac{(x-1)(x+1)}{4}=(\frac{-2}{x+1} )^{2} \frac{(x-1)(x+1)}{4}=\\ = \frac{x-1}{x+1}$