Question

[my name is crazy]

Tìm x biết : \(27^5.3^x=9^{10}\)

Answer 1

[Nguyễn Minh Tiệp]

\(3^{15}.3^x=3^{20}\)

\(3^{15+x}=3^{20}\)

\(\Rightarrow15+x=20\)

\(x=5\)

Answer 2

[I have a crazy idea]

27⁵  . 3^x = 9¹⁰ 

=>     3^x = 9¹⁰ : 27⁵ 

=>     3^x = 9^2.5 : 27⁵

=>     3^x = ( 9²)⁵ : 27⁵ 

=>     3^x = 81⁵ : 27⁵ 

=>     3^x = 3⁵ 

=>       x = 5 

Vậy x = 5