高一增减函数和奇偶性函数 题目 急求解!能给的分都给了T T已知函数f(x)=(ax+b)/(1+x2)是定义在(-1,1)上的奇函数,且f(1/2)=2/5.(1)求f(x)的解析式(2)用定义证明f(x)在(-1,1)上是增函数(3)若f(x

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