log(0.8, 3)*log(3, 1.25)
log_(0,8) 3·log_(3) 1,25= ( log_(3) 3/log_(3)0,8)·log_(3) 1,25= =log_(3) 1,25/log_(3)0,8=log_(0,8)1,25=log_(4/5)(5/4)=-1