(x - 3)³ = 27

<=> (x - 3)³ - 3³ = 0

<=> (x - 3 - 3)(x - 3 + 3) = 0

<=> x(x - 6) = 0

<=> \(\left[{}\begin{matrix}x=0\\x-6=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=6\end{matrix}\right.\)

x⁵ = 6⁵

<=> \(\sqrt[5]{x^5}=\sqrt[5]{6^5}\)

<=> x = 6

sorry bn

\(\dfrac{6}{x-3}=\dfrac{9}{2x-7}\)

<=> \(\dfrac{6\left(2x-7\right)}{\left(x-3\right)\left(2x-7\right)}=\dfrac{9\left(x-3\right)}{\left(2x-7\right)\left(x-3\right)}\)

<=> 6(2x - 7) = 9(x - 3)

<=> 12x - 42 = 9x - 27

<=> 12x - 9x = 42 - 27

<=> 3x = 15

<=> x = 5

x⁵ = 6⁵

<=> \(\sqrt{x^2}=\sqrt{6^2}\)

<=> x = 6

ok

anh giỏi quá

4Al + 3O₂ ---> 2Al₂O₃

Na₂O + H₂O ---> 2NaOH

2KMnO₄ ---> K₂MnO₄ + MnO₂ + O₂

Fe + 2HCl ---> FeCl₂ + H₂

H₂ + CuO ---> Cu + H₂O

2Al + 3H₂SO₄ ---> Al₂(SO₄)₃ + 3H₂

ghê