Question

tìm x biết

(x+2/3)^3= -27

Answer 1

(x+2/3)^3=-27

suy ra (x+2/3)^3=-3^3

suy ra x^3+2/3^3=-3^3

suy ra x^3=-3^3-2/3^3=(-3-2/3)^3

suy ra x^3=-11/3^3

suy ra x=11/3

vậy x =11/3

Answer 2

\(\left(x+\frac{2}{3}\right)^3=-27\)

\(\Leftrightarrow x+\frac{2}{3}=-3\)

\(\Leftrightarrow x=-\frac{11}{3}\)