log5 81*log9 5=
log5 81*1/log5 9=
2log5 9/log5 9=2
log5 81* log9 5= 1/log9 5*log5 81=log9 81= 2Ответ: 2
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log5 81*log9 5=
log5 81*1/log5 9=
2log5 9/log5 9=2
log5 81* log9 5= 1/log9 5*log5 81=log9 81= 2
Ответ: 2