1.mg= [tex] \sqrt{ (\sqrt{5}-2)* ( \sqrt{5}+2) } = \sqrt{5-4} = \sqrt{1} =1[/tex]
2.[tex]A= 8^{2} =64 cm^{2} [/tex]
3.Ma=[tex] \frac{(3-2 \sqrt{2})+(3+2 \sqrt{2}) }{2} = \frac{3-2 \sqrt{2}+3+2 \sqrt{2} }{2}= \frac{0}{2} =0[/tex]
4.
5.[tex] \frac{6}{ \sqrt{3} } = \frac{6 \sqrt{3} }{3} =2 \sqrt{3} [/tex]
6.[tex]3 \sqrt{5} = \sqrt{9*5} = \sqrt{45} [/tex]