В примере b нет ,может место этого х
Log₈₁x+log₉x+log₃x=7 (1/4)log₃x+(1/2)log₃x+log₃x=7
(7/4)log₃x=7 log₃x=7/(7/4) log₃x=4 x=3⁴=81
<span>log2 x + 2 log4 x + 3 log8 x + 4 log16 x = 4
</span>log₂x+ (2/2)log₂x+(3/3)log₂x+(4/4)log₂x=4
4log₂x=4 log₂x=1 x=2
<span>log3 x + 2 log9 x + 3 log2Y x + 4 log81 x = 8
</span>log₃x+(2/2)log₃x+(3/3)log₃3x+(4/4)log₃x=8
4log₃x=8 log₃x=2 x=3²=9