Question

sendo que a= b = 3c e abc = 19944, qual o valor de 2a + b -c?

Answer 1

abc = 19944
3.(abc) = 3.(19944)
3c.a.b = 59832
(a).a.(a) = 59832
a³ = 59832
a = $6 \sqrt[3]{277}$

a = b = $6 \sqrt[3]{277}$

3c = a ====>  c = $\frac{a}{3}$

c = $\frac{6 \sqrt[3]{277} }{3}$

c = $2. \sqrt[3]{277}$

2a + b - c = ? 
2.(6$\sqrt[3]{277}$) + 6.$\sqrt[3]{277}$ - 2.$\sqrt[3]{277}$ = $16. \sqrt[3]{277}$