If $$2^a \times 2^b=2^c$$ and $$0\lt{c}\lt{1}$$, then which of th

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If $$2^a \times 2^b=2^c$$ and $$0\lt{c}\lt{1}$$, then which of the following could be the average (arithmetic mean) of a and b? Indicate all such averages.

答案：A,B,C,D

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