x^3=4.2

解

x^{3} = 4.2

x = 3 \frac{21}{5}, x = \frac{3 21 ( - 1 + 3 i )}{2 3 5}, x = \frac{3 21 ( - 1 - 3 i )}{2 3 5}

解答ステップ

x^{3} = 4.2

x^{3} = f (a)

では, 解は

x = 3 f (a), 3 f (a) \frac{- 1 - 3 i}{2}, 3 f (a) \frac{- 1 + 3 i}{2}

x = 3 4.2, x = 3 4.2 \frac{- 1 + 3 i}{2}, x = 3 4.2 \frac{- 1 - 3 i}{2}

3 4.2 = 3 \frac{21}{5}

簡素化

3 4.2 \frac{- 1 + 3 i}{2} : \frac{3 21 ( - 1 + 3 i )}{2 3 5}

簡素化

3 4.2 \frac{- 1 - 3 i}{2} : \frac{3 21 ( - 1 - 3 i )}{2 3 5}

x = 3 \frac{21}{5}, x = \frac{3 21 ( - 1 + 3 i )}{2 3 5}, x = \frac{3 21 ( - 1 - 3 i )}{2 3 5}