Question

Tìm x biết:

\(\left(1-3x\right)^3=-64\)

Answer 1

Ta có: \(\left(1-3x\right)^3=\left(-4\right)^3\)

Suy ra \(1-3x=-4\) nên \(x=\dfrac{5}{3}\)

Vậy x = \(\dfrac{5}{3}\)

Answer 2

\(\left(1-3x\right)^3=-64\)

\(\left(1-3x\right)^3=\left(-4\right)^3\)

\(1-3x=-4\)

\(3x=1-\left(-4\right)\)

\(3x=5\)

\(x=\dfrac{5}{3}\)

Vậy \(x=\dfrac{5}{3}\)