1) 2^(2 + log₄121) = 2²·2^(log₄121) = 4·2^(0.5·log₂121) = 4·2^(log₂11) = 4·11=44
2) log₈9/log₅9 + log₈12.8 = log₈9·log₈5/log₈5 + log₈12.8 = log₈5 + log₈12.8 =
= log₈5 + log₈(64/5) = log₈5 + log₈64 - log₈5 = log₈5 + 2 - log₈5 = 2
Ответ:
график функции y=-3/x
x²-12x+20=0
{x₁*x₂=20 => {x₁=10
{x₁+x₂=12 {x₂=2
(x-x₁)(x-x₂)=0
(x-10)(x-2)=0