Question

Sa se calculeze... ajutati urgent!!!!!!!

Answer 1

5la18(2x5la 2-9x5) totul supra 5la 18
Se simplifica 5la18
=2x25-45
50-45
5

Answer 2

$\frac{2* 5^{20} -9* 5^{19}}{ 5^{18} } = \frac{2* 5^{18}* 5^{2}-9* 5^{18} *5 }{ 5^{18} } =$
$\frac{ 5^{18}(2* 5^{2}-9*5) }{ 5^{18} } =2* 5^{2} -9*5=50-45=5$