已知a=log3 2 ,用a表示log3 4 - log3 6我怎么觉得是-a呢,可是答案是a-1,

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log3 4 - log3 6
=log3(2*2)-log3(3*2)
=log3 2+log3 2-(log3 3+log3 2)
=a+a-(1+a)
=2a-1-a
=a-1======以下答案可供参考======
供参考答案1:
log3 4=2a log3 6=log3 2+log3 3=a+1 所以log3 4 - log3 6=a-1