\(3^{5x-1}-30=51\)
\(3^{5x-1}=51+30\)
\(3^{5x-1}=81\)
\(3^{5x-1}=3^4\)
\(\Rightarrow5x-1=4\)
\(\Rightarrow5x=5\Rightarrow x=1\)
lấy 51+30=81=3 mũ 4
lấy 4+1=5
vậy 5x=5
lấy 5:5=1 vạy x bằng 1
35.x-1-30=51
35.x-1 =51+30
35.x-1 =81
35.x-1 =34
5.x-1 =4
5.x =4+1
5.x =5
=>x=5:5=1
Vậy x=1
\(3^{5x-1}-30=51\)
\(\Rightarrow3^{5x-1}=51+30=81\)
\(\Rightarrow3^{5x-1}=3^4\)
\(\Rightarrow5x-1=4\)
\(\Rightarrow5x=4+1=5\)
\(\Rightarrow x=5:5=1\)
Vậy \(x=1\)
