log36（9）=log5(9)/log5(36)
=2log5(3)/[log5(4x9)]
=2a/[log5(4)+log5(9)]
=2a/(b+2a)
换底log36(9)=log5(36)/log5(9)=2log5(3)+log5(4)/2log5(3)=2a+b/2a
lg3/lg5=a，2lg2/lg5=b2lg6/2lg3=（lg3+lg2）/lg3=1+lg2/lg3b/a=2lg2/lg3lg2/lg3=b/2a2lg6/2lg3=（lg3+lg2）/lg3=1+lg2/lg3=1+b/2a
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