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= log 30 - log 3/(1/2)
= log 10 + log 3 - log 3^2
= 1 + log(1/3)
= 1 - log 3
= (log 15 × 2 : 3)/log√10
= (log 30 : 3)/log√10
= log 10/log √10
= ^10log√10
= ^10log10^[1/2]
= 1/2 ^10log10
= 1/2 × 1
= 1/2 #A