6)
[tex]\it Dac\breve a\ \ \overline{z}=a+bi,\ \ atunci\ \ z=a-bi.\\ \\ \\ \overline{z}=\dfrac{^{i)}2}{i}+4i+1=\dfrac{2i}{i^2}+4i+1=\dfrac{2i}{-1}+4i++1=-2i+4i+1=1+2i\Rightarrow\\ \\ \\ \Rightarrow z=1-2i[/tex]
