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已知log(12)27=a,求lg(2)/lg(3)的值
人气:478 ℃ 时间:2020-07-13 05:44:13
解答
lg(27)/lg(12)=a
lg(2×3)/lg(3)=1/a
(2lg2+lg3)/3lg3=1/a
(2lg2)/(3lg3)=(1/a)-1/3
(lg2)/(lg3)=(3/2a)-1/2
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