(5x+3^4).6^8=6^9.3^4
5x+3^4=6^9.3^4:6^8=6.3^4
5x=6.3^4-3^4=3^4.(6-1)=3^4.5
x=3^4.5:5=3^4=81
Vậy x=81
Bài này không cần tính nhiều đâu bn ạ!!
\(\left(5x+3^4\right).6^8=6^9.3^4\)
\(\left(5x+3^4\right).6^8=\frac{6^9.3^4}{6^8}\)
\(5x+3^4=6.3^4\)
\(5x=6.3^4-3^4\)
\(5x=3^4\left(6-1\right)\)
5x=3^4.5
x=3^4.5/5
x=3^4=81
t nhé