Дружите тождество log4(6log6(7log7(+1=log4(20)

log4(6log6(7log7(5)))+1=log4(20)
log4(6log6(7log7(5))) = log4(20) - 1 
log4(6log6(7log7(5))) = log4(20) - log4(4)
log4(6log6(7log7(5))) = log4(20/4)
log4(6log6(7log7(5))) = log4(5)
6log6(7log7(5)) = 5
log6(7log7(5)) = 5/6 = log6(6)^5/6
7log7(5) = (6)^5/6
log7(5)^7 = (6)^5/6
5^7 = 7^((6)^5/6)
78125 V 5775
тождество неверно