[Toán 9] Phương trình

S

soccan

$x^3+\dfrac{x^3}{(x-1)^3}+\dfrac{3x^2}{x-1}-2=0\\
\longleftrightarrow (x+\dfrac{x}{x-1})^3-3x.\dfrac{x}{x-1}(x+\dfrac{x}{x-1})+\dfrac{3x^2}{x-1}-2=0\\
\longleftrightarrow (\dfrac{x^2}{x-1})^3-3(\dfrac{x^2}{x-1})^2+\dfrac{3x^2}{x-1}-2=0\\
...$
 
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