Question

tìm x trong tỉ lệ thức

x/8 = x/x^3

 

Answer 1

\(\frac{x}{8}=\frac{x}{x^3}\)

\(\Leftrightarrow\frac{x}{8}=\frac{1}{x^2}\)

\(\Leftrightarrow x\cdot x^2=8\)

\(\Leftrightarrow x^3=8\)

\(\Leftrightarrow x^3=2^3\)

\(\Leftrightarrow x=2\)

Vậy x = 2

Answer 2

Ta co:

\(\frac{x}{8}=\frac{x}{x^3}\Rightarrow x.x^3=x.8\)

\(\Rightarrow x^4=x.8\Rightarrow x^4:x=8\)

\(\Rightarrow x^3=8\Rightarrow x^3=2^3\Rightarrow x=2\)

Vay x=2