Question

Deci vreau sa m,a ajutati la 3 probleme de matematica.Vreau raspunsurile rapid si super corecte.1. Aratati ca numarul a=$\sqrt{1+3+5+.....+99}$ este numar rational

Answer 1

$\sqrt{1+3+5+........+99}= \sqrt{ \frac{50(99+1)}{2}}= \sqrt{25*100}= \sqrt{2500}=50 \in \mathbb{R}$