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  (log5/log2+log0.2/log0.5)(log2/log0.2+log0.5/log5)怎麼算计算机等於-4

  (log5/log2+log0.2/log0.5)(log2/log0.2+log0.5/log5)怎麼算计算机等於-4

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2020-05-3009:49
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乔英霞

  首先,有这么一个规律

  lg0.2=lg5^(-1)=-lg5

  对数的底数也满足这个规律

  所以呢

  log0.2/log0.5=log5/log2

  log2/log0.2=-log2/log5

  log0.5/log5=-log2/log5

  (log5/log2+log0.2/log0.5)(log2/log0.2+log0.5/log5)

  =2log5/log2*(-)2log2/log5

  =-4

2020-05-30 09:53:07
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