已知函数 是定义在R上的奇函数。 (1)求实数a的值; (2)判断f(x)在定义域上的单调性,并用单调性定义证明; (3)当x∈(0,1]时,t·f(x) ≥2 x -2恒成立,求实数t的取值范围。
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