✔ 最佳答案
Suppose [ 5 ] denote base 5
log [5] (3x-11) + log [5] (x-27) = 3 + log [5] 8 = log [5] 5^3 + log [5] 8
log [5] (3x-11)(x-27) = log [5] (5^3)*8
(3x-11)(x-27) = (5^3)*8
3x^2 - 92x + 297 = 1000
3x^2 - 92x - 703 = 0
(x-37)(3x+19) = 0
x = 37
x = - 19/3 , rejected , since x-27 > 0
Ans: x = 37