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受欢迎的代数 >

-2x^3+5=21

解答

- 2 x^{3} + 5 = 21

解答

x = - 2, x = 1 - 3 i, x = 1 + 3 i

求解步骤

- 2 x^{3} + 5 = 21

将

5

到右边

- 2 x^{3} = 16

两边除以

- 2

x^{3} = - 8

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 = 3 - 8, x = 3 - 8 \frac{- 1 + 3 i}{2}, x = 3 - 8 \frac{- 1 - 3 i}{2}

3 - 8 = - 2

化简

3 - 8 \frac{- 1 + 3 i}{2} : 1 - 3 i

化简

3 - 8 \frac{- 1 - 3 i}{2} : 1 + 3 i

x = - 2, x = 1 - 3 i, x = 1 + 3 i

作图

流行的例子

x^3+0.3x^2+0.3x+0.3=0

x^{3} + 0.3 x^{2} + 0.3 x + 0.3 = 0

x^8-2x^5-3x^2=0

x^{8} - 2 x^{5} - 3 x^{2} = 0

x^2+5x-81=5x^5x

x^{2} + 5 x - 81 = 5 x^{5} x

20=[(5+(0.12x))/(10)]^{20}

20 = [\frac{5 + ( 0.12 x )}{10}]^{20}

y^{3} + y^{2} - 3 y - 3 = 0