Răspuns:
(x + 1)/2
Explicație pas cu pas:
d) (x² + x)/(2x + 6) + (2x + 1)/(2x + 6) + (x + 2)/(2x + 6)
(x² + x + 2x + 1 + x + 2)/(2x + 6)
(x² + 4x + 3)/[2 × (x + 3)]
[x × (x + 3) + x + 3)]/[2 × (x + 3)]
[(x + 3)(x + 1)]/[2(x + 3)]
