log7为底数9为真数与long6为底数8为真数比较大小.

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log7为底数9为真数与long6为底数8为真数比较大小.

log7(9)=log(9)/log(7)=(log(6)*log(9))/(log(6)*log(7))
log6(8)=log(8)/log(6)=(log(7)*log(8))/(log(6)*log(7))
因为:log(6)*log(9)=0.742545
log(7)*log(8)=0.7631996
所以:log6(8)>log7(9)