3.4x-2+4x-1+4x=92
4x(3+1+1)-2-1=92
4x.5-2-1=92
4x.5 =92+1+2
4x.5 =95
4x =95:5
4x =19
3.4x-2+4x-1+4x=92
4x(3+1+1)-2-1=92
4x.5-2-1=92
4x.5 =92+1+2
4x.5 =95
4x =95:5
4x =19
đây em nhé
\(3\cdot4^{x-2}+4^{x-1}+4^x=92\)
\(4^{x-2}\left(3+4+4^2\right)=92\)
\(4^{x-2}\cdot23=92\)
\(4^{x-2}=4\)
\(x-2=1\)
\(x=3\)
3.4x-2+4x-1+4x=92
4x(3+1+1)-2-1=92
4x.5-2-1 =92
4x.5 =92+1+2
4x.5 =95
4x =95:5
4x =19