• 计算:(1)0.064 -13-(78)0+16 34+(√2?3√3)6(2)lg12-lg58+lg12.5+log23?log38.试题及答案-解答题-云返教育

    • 试题详情

      计算:
      (1)0.064
      -
      1
      3
      -(
      7
      8
      0+16
      3
      4
      +(
      2
      ?
      33
      6
      (2)lg
      1
      2
      -lg
      5
      8
      +lg12.5+log23?log38.

      试题解答


      见解析
      解:(1)0.064 -
      1
      3
      -(
      7
      8
      0+16
      3
      4
      +(
      2
      ?
      33
      6
      =(0.4
      3)-
      1
      3
      -1+(24)
      3
      4
      +(2
      1
      2
      ?3
      1
      3
      )6
      =0.4
      -1-1+23+23?32
      =
      5
      2
      -1+8+72
      =-
      153
      2

      (2)lg
      1
      2
      -lg
      5
      8
      +lg12.5+log23?log38
      =-lg2-(lg5-lg8)+lg
      5
      4
      +
      lg3
      lg2
      ?
      lg8
      lg3

      =-lg2-lg5+3lg2+lg5-2lg2+3
      =3.
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