Question

sa se scrie primi 4 termeni ai progresii aritmetice daca:
a)a1=$\frac{2}{7}$ a2=$\frac{1}{5}$
b)a1=$\sqrt{2}$ a2=$\sqrt{8}$

Answer 1

a.r= a2-a1=1/5-2/7=7/35-10/31=-3/35, a3=a2+r=1/5-3/35=4/35, a4=a3+r=4/35-3/35=1/35
b. r=a2-a1=√8-√2=2√2-√2=√2, a3=a2+r=2√2+√2=3√2, a4=a3+r=3√2+√2=4√2