Simplify [(1/3)^-2 - (1/2)^-3 + (1/4)^-1]^-1 / 5^-2
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=>[(1/3)^-2 - (1/2)^-3 + (1/4)^-1]^-1 / 5^-2
=>[ 3^2 - 2^3 + 4^1]^-1/1/5^2
=> [9-8+4]^-1 /1/5^2
=> (5)^-1/ 1/5^2
answer is 5....
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