x^{10}=20

解答

x^{10} = 20

x = 1020, x = - 1020

十进制

x = 1.34928 \dots, x = - 1.34928 \dots

求解步骤

x^{10} = 20

对于

x^{n} = f (a)

，n 为偶数，解为

x = n f (a), - n f (a)

x = 1020, x = - 1020

2 a^{2} - a - 2 = 0.8 a^{6} - 13 a^{3} - 3

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

x^{10} = - x

- x^{3} + 9 x^{2} - 24 x + 20 = 0

(x^{2} - 8)^{2} - 2 (x^{2} - 8) + 1 = 0