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受欢迎的代数 >

15.625=s^3

解答

15.625 = s^{3}

解答

s = \frac{5}{2}, s = - \frac{5}{4} + \frac{5 3}{4} i, s = - \frac{5}{4} - \frac{5 3}{4} i

求解步骤

15.625 = s^{3}

交换两边

s^{3} = 15.625

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}

s = 3 15.625, s = 3 15.625 \frac{- 1 + 3 i}{2}, s = 3 15.625 \frac{- 1 - 3 i}{2}

3 15.625 = \frac{5}{2}

化简

3 15.625 \frac{- 1 + 3 i}{2} : - \frac{5}{4} + \frac{5 3}{4} i

化简

3 15.625 \frac{- 1 - 3 i}{2} : - \frac{5}{4} - \frac{5 3}{4} i

s = \frac{5}{2}, s = - \frac{5}{4} + \frac{5 3}{4} i, s = - \frac{5}{4} - \frac{5 3}{4} i

作图

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