已知a=log3 2 ,用a表示log3 8-2log3 6是 ?

问题描述:

已知a=log3 2 ,用a表示log3 8-2log3 6是 ?

log3 8-2log3 6
= 3log3 2 - 2(log 3 3 + log 3 2)
= 3log3 2 - 2(1 + log3 2)
= log 3 2 - 2
= a - 2