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【简答题】
已知函数 是奇函数，定义域为区间D（使表达式有意义的实数x 的集合）． （1）求实数m的值，并写出区间D； （2）若底数a满足0＜a＜1，试判断函数y=f（x）在定义域D内的单调性，并说明理由； （3）当x∈A=[a，b）（A D，a是底数）时，函数值组成的集合为[1，+∞），求实数a、b的值．
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