Log81(6^4)*log6(9) = log9^2 (6^4) * log6(9) = 4/2 log9(6) * log6(9) = (дробь)(4*log9(6))/(9*log9(6)) = 4/2 = 2
26m 32k=64g вот так ппппп
27x^3-y^3+9x^2*y-3xy^2=(3x-y)(9x^2 +3xy+y^2)+3xy(3x-y)
(43x+15c)+(57x-3c)=43x+15c+57x-3c=100x+12c
при x=0.23; c=14.2 то 100x+12c=100*0.23+12*14.2=23+170.4=193.4