5^20 : ( 5^15 x 6 + 5^15 x 19 ) = 125
k cho mk nha
5 mũ 20 chia(5 mũ 15 nhân(6+19))=5 mũ 20 chia (5 mũ 15 nhân 25)=5 mũ 20 chia 5 mũ 17=5 mũ 3
\(5^{20}:\left(5^{15}.6+5^{15}.19\right)\)
\(=5^{20}:\left(5^{15}.\left(6+19\right)\right)\)
\(=5^{20}:\left(5^{15}.25\right)\)
\(=5^{20}:\left(5^{15}.5^2\right)\)
\(=5^{20}:5^{17}\)
\(=5^3\)
\(=125\)