若3^a=2,则log3(8)-2log3(6)用a的代数式表示为
人气:423 ℃ 时间:2020-02-05 08:39:57
解答
3^a=2
a=log3 2
log3 8-2log 3 6
=log3 2^3-2log 3 2*3
=3log3 2-2(log3 2+log3 3)
=3a-2(a+1)
=a-2
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