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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.
A、0.1
B、0.2
C、0.3
D、0.4
E、0.5
F、0.6
G、
G
0.7
答案:A,B,C,D
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