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


Răspuns :

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