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受欢迎的代数 >

x^{12}=8

解答

x^{12} = 8

解答

x = 2, x = - 2, x = 2 i, x = - 2 i, x = \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i

求解步骤

x^{12} = 8

用

u = x^{2}

和

u^{6} = x^{12}

改写方程式

u^{6} = 8

解

u^{6} = 8 : u = 2, u = - 2, u = \frac{1}{2} + \frac{3}{2} i, u = - \frac{1}{2} - \frac{3}{2} i, u = - \frac{1}{2} + \frac{3}{2} i, u = \frac{3}{2 \frac{3}{2}} - \frac{3}{2} i

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

代回

u = x^{2}

，求解

x

解

x^{2} = 2 : x = 2, x = - 2

解

x^{2} = - 2 : x = 2 i, x = - 2 i

解

x^{2} = \frac{1}{2} + \frac{3}{2} i : x = \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i

解

x^{2} = - \frac{1}{2} - \frac{3}{2} i : x = - \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i

解

x^{2} = - \frac{1}{2} + \frac{3}{2} i : x = \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i

解

x^{2} = \frac{3}{2 \frac{3}{2}} - \frac{3}{2} i : x = - \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i

解为

x = 2, x = - 2, x = 2 i, x = - 2 i, x = \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2 3} + \frac{3}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2 3} - \frac{3}{4 2 ^{3}} i, x = - \frac{\frac{3}{2}}{4 2} + \frac{1}{4 2 ^{3}} i, x = \frac{\frac{3}{2}}{4 2} - \frac{1}{4 2 ^{3}} i

作图

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