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(1)由ax-1>0,得ax>1.(1分)當a>1時,x>0;(2分)當0<a<1時,x<0.(3分)所以f(x)的定義域是當a>1時,x∈(0,+∞);當0<a<1時,x∈(-∞,0).(4分)(2)當a>1時,任取x1、x2∈(0,+∞),…
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