Question

AJUTOR ! LICEU - PROGRESII
Aratati ca:
1/b+c; 1/c+a; 1/a+b
Este o progresie aritmetica

Answer 1

a)$\frac{1}{b} + c$ = $\frac{bc+1}{b}$
b)$\frac{1}{c}+a= \frac{ac+1}{c}$
c)$\frac{1}{a} +b =\frac{ab+1}{a}$