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受欢迎的代数 >

x^3-81=0

解答

x^{3} - 81 = 0

解答

x = 333, x = \frac{3 ( - 3 3 + 6 3 ^{5} i )}{2}, x = \frac{3 ( - 3 3 - 6 3 ^{5} i )}{2}

求解步骤

x^{3} - 81 = 0

将

81

到右边

x^{3} = 81

对于

x^{3} = f (a)

解为

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

x = 381, x = 381 \frac{- 1 + 3 i}{2}, x = 381 \frac{- 1 - 3 i}{2}

381 = 333

化简

381 \frac{- 1 + 3 i}{2} : \frac{3 ( - 3 3 + 6 3 ^{5} i )}{2}

化简

381 \frac{- 1 - 3 i}{2} : \frac{3 ( - 3 3 - 6 3 ^{5} i )}{2}

x = 333, x = \frac{3 ( - 3 3 + 6 3 ^{5} i )}{2}, x = \frac{3 ( - 3 3 - 6 3 ^{5} i )}{2}

作图

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