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用換底公式 p=lg3/lg8=lg3/3lg2 lg2=lg3/(3p) q=lg5/lg3 lg3=lg5/q 代入lg2=lg3/(3p) lg2=lg5/(3pq) lg2=1-lg5 所以1-lg5=lg5/(3pq) lg5=1/[1+1/(3pq)]=3pq/(3pq+1)
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