唔..sos...数学达人请...头晕ing..取lg2=0.3010,则lg2.5=_____偶基道答案是0.3980..but只会一半- -1汗呜..刚学对数`那个叫晕菜...题目它认识咱,咱不认识它- -1..教下呢~感激ing...
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![唔..sos...数学达人请...头晕ing..取lg2=0.3010,则lg2.5=_____偶基道答案是0.3980..but只会一半- -1汗呜..刚学对数`那个叫晕菜...题目它认识咱,咱不认识它- -1..教下呢~感激ing...](/uploads/image/z/14578645-13-5.jpg?t=%E5%94%94..sos...%E6%95%B0%E5%AD%A6%E8%BE%BE%E4%BA%BA%E8%AF%B7...%E5%A4%B4%E6%99%95ing..%E5%8F%96lg2%3D0.3010%2C%E5%88%99lg2.5%3D_____%E5%81%B6%E5%9F%BA%E9%81%93%E7%AD%94%E6%A1%88%E6%98%AF0.3980..but%E5%8F%AA%E4%BC%9A%E4%B8%80%E5%8D%8A-+-1%E6%B1%97%E5%91%9C..%E5%88%9A%E5%AD%A6%E5%AF%B9%E6%95%B0%60%E9%82%A3%E4%B8%AA%E5%8F%AB%E6%99%95%E8%8F%9C...%E9%A2%98%E7%9B%AE%E5%AE%83%E8%AE%A4%E8%AF%86%E5%92%B1%2C%E5%92%B1%E4%B8%8D%E8%AE%A4%E8%AF%86%E5%AE%83-+-1..%E6%95%99%E4%B8%8B%E5%91%A2%EF%BD%9E%E6%84%9F%E6%BF%80ing...)
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唔..sos...数学达人请...头晕ing..取lg2=0.3010,则lg2.5=_____偶基道答案是0.3980..but只会一半- -1汗呜..刚学对数`那个叫晕菜...题目它认识咱,咱不认识它- -1..教下呢~感激ing...
唔..sos...数学达人请...头晕ing..
取lg2=0.3010,则lg2.5=_____
偶基道答案是0.3980..but只会一半- -1汗
呜..刚学对数`那个叫晕菜...题目它认识咱,咱不认识它- -1
..教下呢~感激ing...
唔..sos...数学达人请...头晕ing..取lg2=0.3010,则lg2.5=_____偶基道答案是0.3980..but只会一半- -1汗呜..刚学对数`那个叫晕菜...题目它认识咱,咱不认识它- -1..教下呢~感激ing...
1
lg2.5
=lg(5/2)=lg5-lg2=1-2lg2=1-2*0.3010=0.3980
补充:
lg2+lg5=1
lg(a/b)=lga-lgb
lg2=0.3010,则
lg2.5=lg5-lg2=1-lg2-lg2=1-0.6020=0.3980
lg2.5=lg(10÷2÷2)=lg10-lg2-lg2=1-0.3010-0.3010=0.398
把2.5化为10/4,
即:lg2.5=lg(10/4)=lg10-lg4=1-2lg2