[tex]\it 5)\ \mathcal{P}=3\cdot \ell=27|_{:3} \Rightarrow \ell=9\ dm\\ \\ 6)\ 360^o:10=36^o[/tex]
(suma măsurilor unghiurilor formate în jurul unui punct este 360°)
[tex]\it 2)\ a=0,75+4^{-1}=\dfrac{3}{4}+\dfrac{1}{4} =1\\ \\ \\ b=\Big(-\dfrac{1}{2}\Big)^0\cdot\Big(-\dfrac{1}{2}\Big)^1\cdot\Big(-\dfrac{1}{2}\Big)^2= 1\cdot\Big(-\dfrac{1}{2}\Big)\cdot\Big(\dfrac{1}{4}\Big) =-\dfrac{1}{8}\\ \\ \\ a-b=1-\Big(-\dfrac{1}{8}\Big)=1+\dfrac{1}{8} =\dfrac{9}{8}[/tex]
