log(a+b/3)= 1/2(log a+ log b)
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㏒ ( a + b/3 )= 1/2(㏒ a+ ㏒ b)
㏒ (a+b/3 )= 1/2 ( ㏒ab)
= ㏒ ( (ab)^1/2)
⇒ a+b/3 = ab^1/2
a+b /3 =√(ab)
a+b= 3√(ab)
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