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b=log3(5) 原式=1/2*log3(30) =1/2*log3(2*3*5) =1/2*[log3(2)+log3(3)+log3(5)] =(a+b+1)/2
log a∧8=-3, ∴a^(-3)=8 ∴1/a³;=8 ∴a³;=1/8 ∴a=1/2
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