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受欢迎的代数 >

-x^3+21=0

解答

- x^{3} + 21 = 0

解答

x = 321, x = - 321 \frac{1}{2} + 321 \frac{3}{2} i, x = - 321 \frac{1}{2} - 321 \frac{3}{2} i

求解步骤

- x^{3} + 21 = 0

将

21

到右边

- x^{3} = - 21

两边除以

- 1

x^{3} = 21

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 = 321, x = 321 \frac{- 1 + 3 i}{2}, x = 321 \frac{- 1 - 3 i}{2}

化简

321 \frac{- 1 + 3 i}{2} : - 321 \frac{1}{2} + 321 \frac{3}{2} i

化简

321 \frac{- 1 - 3 i}{2} : - 321 \frac{1}{2} - 321 \frac{3}{2} i

x = 321, x = - 321 \frac{1}{2} + 321 \frac{3}{2} i, x = - 321 \frac{1}{2} - 321 \frac{3}{2} i

作图

流行的例子

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\frac{x}{5} = - 9

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