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已知f(x)是定义在R上的奇函数,且当x>0时f(x)=ex+a,若f(x)在R...
已知f(x)是定义在R上的奇函数,且当x>0时f(x)=ex+a,若f(x)在R上是单调函数,则实数a的最小值是 .
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