If a =$$(27)(3^{-2})$$and x =$$(6)(3^{-1})$$, then which of the f

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If a =$$(27)(3^{-2})$$and x =$$(6)(3^{-1})$$, then which of the following is equivalent to$$(12)(3^{-x})$$ x $$(15)(2^{-a})$$?

答案：C

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