Question

помогите пж умоляю плизззз номер 21​

Answer 1

Решение:

а) 1/(n+1) и 1/(n-2) ;

1/(n+1) + 1/(n-2) = (n-2)/(n+1)(n-2)+ (n+1)/(n+1)(n-2) = (n-2+n+1)/(n+1)(n-2) = (2n-1)/(n²-n-2);

б) 1/(х+1) и 1/(х-2) ;

1/(х+1) - 1/(х-2) = (х-2)/(х+1)(х-2)- (х+1)/(х+1)(х-2) = (х-2-х-1)/(х+1)(х-2) = -3/(х²-х-2);