27 to the power 2 ×(-m) to the power 5 n to the power 2 ÷ 18 to the power 3 × m to the power 3 n
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=(3)^3×-2m×5n×2/18×3m×3n
=(3)^-15mn×2×mn
=(1/3)^30m^2 n^2
=(3)^-15mn×2×mn
=(1/3)^30m^2 n^2
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