Tìm x. Biết

(x 2/3 )³ = 1/27

(x + 1/2 ) ² = 1/6

60% x + 2/3x = 76

( x - $\frac{2}{3}$ ) ³ = $\frac{1}{27}$ 

⇒ ( x - $\frac{2}{3}$ ) ³ = ( $\frac{1}{3}$  ) ³

⇒ x - $\frac{2}{3}$ = $\frac{1}{3}$ 

⇒ x = 1

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( x + $\frac{1}{2}$ ) ² = $\frac{1}{6}$ 

⇒ x² + $\frac{1}{4}$ = $\frac{1}{6}$ 

⇒ x² = $\frac{1}{12}$

⇒ x =  $\sqrt{\frac{1}{12}}$

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60% x + $\frac{2}{3}$ x = - 76

⇒ x  ( $\frac{3}{5}$ + $\frac{2}{3}$ ) = - 76

⇒ x $\frac{19}{15}$ = - 76

⇒ x = -76$\frac{15}{19}$