log2 6-log2 3=log2 （6÷3）=log2 2=1,
lg5+lg2=lg（5×2）=lg10=1,
log5 3+log5 1/3=log5 （3×1/3)=log5 1=0,
log3 5-log3 15=log3 (5÷15）=log 3 （1/3)=-1
计算log2 6-log2 3,lg5+lg2,log5 3+log5 1/3,log3 5-log3 15
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