✔ 最佳答案
(x + 8)/5 + (x + 5)/x = 1
5x[(x + 8)/5 + (x + 5)/x] = 5x[1]
x(x + 8) + 5(x + 5) = 5x
x^2 + 8x + 5x + 25 = 5x
x^2 + 13x - 5x + 25 = 0
x^2 + 8x + 25 = 0
x = [-b ±√(b^2 - 4ac)]/2a
a = 1
b = 8
c = 25
x = [-8 ±√(64 - 100)]/2
x = [-8 ±√(-36)]/2
x = [-8 ±√(3^2 * i^2 * 2^2)]/2
x = [-8 ±6i]/2
x = -4 ±3i
∴ x = -4 ±3i