已知3的a方=2,那么log(3)8-2log(3)6用a表示是?
人气:315 ℃ 时间:2020-05-08 09:00:42
解答
∵3^a=2
∴a=log(3)2
则:
log(3)8-2log(3)6
=log(3)2^3-2log(3)(2*3)
=3log(3)2-2[log(3)2+log(3)3]
=3a-2(a+1)
=a-2
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