Question

\(\dfrac{5^5}{5^x}=5^{18}\)

\(\dfrac{x-7}{6}=\dfrac{3}{2\left(x-7\right)}\)

Answer 1

\(\dfrac{5^5}{5^x}=5^{18}\)

\(\Rightarrow5^x=5^5:5^{18}\)

\(\Rightarrow5^x=5^{-13}\)

\(\Rightarrow x=-13\)

\(\dfrac{x-7}{6}=\dfrac{3}{2\left(x-7\right)}\)

\(\Rightarrow2\left(x-7\right)\left(x-7\right)=18\)

\(\Rightarrow2\left(x-7\right)^2=18\)

\(\Rightarrow\left(x-7\right)^2=9\)

\(\Rightarrow\left[{}\begin{matrix}x-7=-3\\x-7=3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=4\\x=10\end{matrix}\right.\)

Answer 2

Help me, please!

Mai mk phải nộp rồi, nhanh lên nhé.

Arigatou! Mina-san.

Answer 3

Mấy bạn ko cần giúp mk câu trên đâu nhé, mk làm được rồi.