3x-2-19=62
=> 3x-2=62+19
=> 3x-2=81
=> 3x-2=34
=> x-2=4
=> x=4+2
=> x=6
10.3x=3117+3115
=> 10.3x=3115.(32+1)
=> 10.3x=3115.(9+1)
=> 3x.10=3115.10
=> 3x=3115
=> x=115
2448-(5x+48)=2000
=> 5x+48=2448-2000
=> 5x+48=448
=> 5x=448-48
=> 5x=400
=> x=400:5
=> x=80
1)\(3^{x-2}=62+19=81=3^4\)
=> x- 2 = 4
=> x = 6
2) \(2448-\left(5x+48\right)=2000\)
5x + 48 = 448
5x = 448 - 48
5x = 400
x = 80
3) \(10.3^x=3^{115}\left(3^2+1\right)=3^{115}.10\)
=> x =115
Bà con ơi thắng Trần câu nào cùng được 2,3 lik-e cả chắc trao đổi lik-e
\(3^{x-2}-19=62\)
\(3^{x-2}=62+19\)
\(3^{x-2}=81\)
\(3^x=3^4\)
\(\Rightarrow x=4\)
2448-(5x+48)=2000
5x+48=2448-2000
5x+48=448
5x=448-48
5x=400
x=400:5
x=80