1. 3 log 54 -3 log 2 + 3 log 81
= 3 log ( 54×81/2)
= 3 log 2187
= 7
2. (x^3 y ^-1) / x y^-4) ^-2
= (x^3/y) / x/y^4) ^-2
= (x/y^4) / x^3/y) ^ 2
= x^-4 y^-6
= 1 / x^4 y^6
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1. 3 log 54 -3 log 2 + 3 log 81
= 3 log ( 54×81/2)
= 3 log 2187
= 7
2. (x^3 y ^-1) / x y^-4) ^-2
= (x^3/y) / x/y^4) ^-2
= (x/y^4) / x^3/y) ^ 2
= x^-4 y^-6
= 1 / x^4 y^6