摘要: 用lgx.lgy.lgz表示下列各式: (1) lg(xyz), (2)lg, (3), (4) 解:(1) lg(xyz)=lgx+lgy+lgz, (2) lg =lgx-lgz=lgx+lg-lgz =lgx+2lgy-lgz, (3) =lgx-lg =lgx+lg- lgz =lgx+3lgy- lgz, (4)
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