Question

ultima cifra a numarului 9 la puterea 72​

Answer 1

$\displaystyle\bf\\U\Big(9^{72}\Big)=U\Big(9^{2\times36}\Big)=U\left(\Big(9^{2}\Big)^{36}\right)=U\Big(81^{36}\Big)=U\Big(1^{36}\Big)=\boxed{\bf1}$