Question

tìm x

5^2x-3-2.5²=5².3

Answer 1

\(5^{2x-3}-2.5^2=5^2.3\)

\(5^{2x-3}-50=75\)

=>\(5^{2x-3}=75+50=125\)

Mà \(5^{2x-3}=125=5^3\)

=>2x-3=3

    2x=3+3=6

=>x=3

Answer 2

 

-52x-32.52=52.3

\(5^{2x-3}\)-50=75

\(5^{2x-3}\)=75+50

\(5^{2x-3}\)=215

\(5^{2x-3}\) =\(5^3\)

\(\Rightarrow\) \(2x-3=3\)

\(2x=3+3\)

\(2x=6\)

\(x=6:2\)

\(x=3\)

Vậy x = 3

Answer 3

x = 3

đúng ko