Ответ:

Пошаговое объяснение:

1)log3(81)+2^log2(7)

log3(3^4)+7

4+7=11

2)2log4(5) + log4(9) / log4(45)-log4(3)

log4(5^2*9) / log4(45/3)

log4(25*9) / log4(15)

log4(225) / log4(15)

log4(15^2) / log4(15)

2log4(15) / log4(15) = 2