$\text{Nhân từng vế 3 đẳng thức ta được:}$
$\text{⇒ ab.bc.c.a = 2.3.54}$
$\text{⇒ (abc)² = 324}$
$\text{⇒ (abc)² = 18² = (-18)²}$
$\text{+) abc = 18}$
$\text{⇒ a = 18 : 3 = 6}$
$\text{⇒ b = 18 : 54 =}$ $\dfrac{1}{3}$
$\text{⇒ c = 18 : 2 = 9}$
$\text{+) abc= -18}$
$\text{⇒ a = -18 : 3 = -6}$
$\text{⇒ b = -18 : 54 =}$ $\dfrac{-1}{3}$
$\text{⇒ c = -18 : 2 = -9}$
$\text{Vây a,b,c = 6,}$ $\dfrac{1}{3}$ $\text{,9}$
$\text{Hay a,b,c = -6,}$ $\dfrac{-1}{3}$ $\text{,-9}$
#BanhQuyy
