呼！總算算出來了！
(log_2 x)^2 - 12 * (log_2 x) + 4 = 0
設 log_2 x = y
y^2 - 12y + 4 = 0
y = 0.35 or 11.65
log_2 x = 0.35 ---> x = 1.27 = a
log_2 x = 11.65 ---> x = 3213.66 = b
log_a b = log_1.27 3213.66 = 33.78
log_b a = log_3213.66 1.27 = 0.03
方程式 => (x-33.78)*(x-0.03) = x^2 + 34x + 1.................ans
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