Question

Tìm n :

5 mũ 2 x n - 3 - 2 x 5 mũ 2 = 5 mũ 2 x 3

Khó hiểu thì cứ hỏi mk nhé!

Answer 1

\(5^2.n-3-2.5^2=5^2.3\)

\(\Rightarrow25n-3-2.25=25.3\)

\(\Rightarrow25.n-3-50=75\)

\(\Rightarrow25.n-53=75\)

\(\Rightarrow25.n=128\)

\(\Rightarrow n=\frac{128}{25}\)

Answer 2

\(5^2.n-3-2.5^2=5^2.3\)

\(\Rightarrow5^2.\left(n-2\right)-3=5^2.3\)

\(\Rightarrow\left(n-2\right)-3=3\)

\(\Rightarrow n-2=3+3\)

\(\Rightarrow n-2=6\)

\(\Rightarrow n=6+2\)

\(\Rightarrow n=8\)