利用换底公式求值.log2（25）×log3（4）×log5(9)
人气：223 ℃ 时间：2020-03-29 11:25:15
解答
=2log2(5)*2log3(2)*2log5(3)
=2log3(5)/log3(2)*2log3(2)*2log5(3)
=8log3(5)*log5(3)
=8log5(5)/log5(3)*log5(3)=8
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