Question

efectuati (5^20+5^19+5^18):5^18

Answer 1

$( {5}^{20} + {5}^{19} + {5}^{18} ) \div {5}^{18}$

$= {5}^{20} \div {5}^{18} + {5}^{19} \div {5}^{18} + {5}^{18} \div {5}^{18}$

$= {5}^{20 - 18} + {5}^{19 - 18} + 1$

$= {5}^{2} + 5 + 1$

$= 25 + 5 + 1$

$= 30 + 1$

$= 31$