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2log5 10+log5 0.25-3log2 64 急死了!
人气:443 ℃ 时间:2020-01-29 03:36:43
解答
2log5 10+log5 0.25-3log2 64
=log5 100+log5 0.25-3×6
=log5(100×0.25)-18
=2-18
=-16
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