Ответ(ы) на вопрос:
Гостьlog(7+4√3) (7-4√3) = log(7+4√3) (7-4√3) +1 -1 =
= log(7+4√3) (7-4√3) +log(7+4√3) (7+4√3) -1 =
= log(7+4√3) (7-4√3)(7+4√3) -1 =
= log(7+4√3) (7^2 -16*3) -1 =
= log(7+4√3) (49 -48) -1 =
= log(7+4√3) 1 -1 =
= 0 -1 = -1
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