Hasil dari 1/(x+1)-1/(x+2) a. 0 b. 1/(x+1)(x+2) c. 1 d. 3/(x+1)(x+2)

perlu diketahui 1/a - 1/b = (b-a) / ab
1/(x+1) - 1/(x+2)
= {(x+2)-(x+1)} / (x+1)(x+2)
= (x + 2 - x - 1) / (x+1)(x+2)
= 1 / (x+1)(x+2)