作业帮41.2=10*LOG(A/1000) 求A值和具体计算步骤
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41.2=10*LOG(A/1000) 求A值和具体计算步骤
41.2=10*LOG(A/1000) 求A值和具体计算步骤
41.2=10*LOG(A/1000) 求A值和具体计算步骤
10*log(a/1000)=10*(loga-log1000)=10*(loga-3)=10*loga-30=41.2=>loga=7.12=>a=10^7.12
41.2=10*LOG(A/1000) 求A值和具体计算步骤
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