Question

Tìm x biết:

x² = x⁵

Answer 1

\(x^2=x^5\)

\(\Rightarrow x^2-x^5=0\)

\(\Rightarrow x^2.\left(1-x^3\right)=0\)

\(\Rightarrow x^2=0\) hoặc \(1-x^3=0\)

+) \(x^2=0\Rightarrow x=0\)

+) \(1-x^3=0\Rightarrow x^3=1\Rightarrow x=1\)

Vậy \(x\in\left\{0;1\right\}\)

Answer 2

\(x^2=x^5\)

\(x^2.1=x^2.x^3\)

\(\Rightarrow x^3=1\)

\(\Rightarrow x=1\)

 

Answer 3

\(x^2=x^5\)

=> \(x^2-x^5=0\)

=> \(x^2\left(1-x^3\right)=0\)

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