lg12-1/lg1.2等于?
为什么lg12-1等于lg10/12
人气:368 ℃ 时间:2020-10-01 11:37:27
解答
lg12-1/lg1.2
=(lg12-1)/lg1.2
=(lg12-1)/(lg(12÷10))
=(lg12-1)/(lg12-lg10)
=(lg12-1)/(lg12-1)
=1;
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