3)
[tex]n = ( {5}^{6} )^{7} \div {25}^{21} \\ n = {5}^{42} \div ({5}^{2} ) ^{21} \\ n = {5}^{42} \div {5}^{42} \\ n = {5}^{0} \\ n = 1 \\ {n}^{2017} = {1}^{2017} = 1[/tex]
4)
[tex]a = (2 \times ({2}^{2})^{2} \times ({2}^{3})^{3} ) \div ({2}^{5} ) ^{12} [/tex]
a= (2 x 2la puterea 4 x 2la puterea 9 x )la puterea 5 : 2la puterea 60
a=(2la puterea 14) la puterea 5 : 2la puterea 60
a=2 la puterea 70 : 2la puterea 60
a=2 la puterea 10
a=4 la puterea 5
