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Zhabei district experimental primary school mathematics
A: Since a> 1, the function based on A must be incremental. So logaX belongs to that kind of:

LogaX+logaY belongs to [2, loga(2a)+2], namely:

2 < = c < = loga (2)+3, so the set of values of a is deduced as: (1, 2 (1/(c-3))]