m=log3(5)=lg5/lg3
n=log8(3)=lg3/lg8=(lg3/lg2)/3
lg5=(lg5/lg3)*(lg3/lg2)*lg2=3mn/lg2
lg5lg2=lg5(1-lg5)=3mn
(lg5)^2-lg5+3mn=0
log3 5=m ,log8 3=n 求lg5
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