Respostas

2013-08-30T16:46:30-03:00
log_{9} 81...????...isso??
Resposta ...2....
pq.... 9²=81
1 5 1
2013-08-30T19:24:52-03:00
Log 81 na base 9
 9^x = 81 
9²=81
x=2
2 3 2