Числитель: (2 =log7 49)
log1/7 147 +log7 49 = -log7 147 +log7 49=
=log7 (49/147) = log7 (1/3)
знаменатель: (1/2 = log49 7)
log49 (1/63) + log49 7 =log49 (7/63) =log7² (1/9) =
=(1/2) *log7 (1/9)=log7 (1/3)
дробь: (log7 1/3) / (log7 1/3) =1; ответ Е)1
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использованы формулы:
loga b^n = n* loga b
loga^n b =(1/n)* loga b
loga b + loga c = loga b*c
loga b - loga c = loga b/c