Question

1. Tìm x , biết :

g) ( x⁴)² = \(\frac{x^{12}}{x^5}\)

 

Answer 1

g)\(\left(x^4\right)^2=\frac{x^{12}}{x^5}\)

\(\Rightarrow x^8=x^7\)

\(\Rightarrow x^8-x^7=0\)

\(\Rightarrow x^7\left(x-1\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x^7=0\\x-1=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=1\end{array}\right.\)

Answer 2

\(\Rightarrow x^{2.4}=x^{12-5}\)

\(\Rightarrow x^8=x^7\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=0\\x=1\end{array}\right.\)

Vậy x=0 hoặc x=1