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3 a^-3 b^-5 c^-2
(2 a b^2 c^2) ^3
3
8 a^3 b^6 c^6
27
2. 6 log 20 = 6 log 2*10 = b 6 log 30 = a
6 log 2*10 = 6 log 2 + 6 log 10 = b 6 log 6*5= a
6 log 2 + 6 log 2*5 = b 6 log 6 + 6 log 5 = a
6 log 2 + 6 log 2 + 6 log 5 = b 1 + 6 log 5= a
2(6log2)+ a - 1= b 6 log 5= a-1 6 log 2= b+1-a
2