Răspuns :
[tex] {9}^{45} \div {9}^{42} - {2}^{1} \times {3}^{3} + 20[/tex]
[tex] = {9}^{45 - 42} - 2 \times 27 + 20[/tex]
[tex] = {9}^{3} - 54 + 20[/tex]
[tex] = 729 - 54 + 20[/tex]
[tex] = 675 + 20[/tex]
[tex] = 695[/tex]
[tex] = {9}^{45 - 42} - 2 \times 27 + 20[/tex]
[tex] = {9}^{3} - 54 + 20[/tex]
[tex] = 729 - 54 + 20[/tex]
[tex] = 675 + 20[/tex]
[tex] = 695[/tex]