Question

Ajutați-mă va rog frumos!​

Answer 1

$\it c)\ \ A\cup B=\{1,\ 2,\ 3,\ 4,\ 5,\ 6\};\ \ (A\cup B)\cap C=\{1,\ 3,\ 6\}\\ \\ \\ 5.\\ \\ a)\ \mathcal{V}=120^3=120\cdot120\cdot120=1728000\ cm^3\\ \\ b)\ \ \mathcal{V}=182800\ cm^3=1728\ dm^3=1728\ \ell$

$\it c)\ \ S=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\ ...\ +\dfrac{1}{31}-\dfrac{1}{33}=\dfrac{^{11)}1}{\ \ 3}-\dfrac{1}{33}=\dfrac{10}{33}$