lg1/2-lg5/8+lg25/2-log8 9*log27 8
=lg(1/2÷5/8x25/2)- lg9/lg8 x lg8/lg27
=lg10-1/3
=1-1/3
=2/3
注：lg27=3lg9
lg1/2-lg5/8+log25/2-log8 9*log27 8
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