一道数学函数单调性问题函数f(x)=ln 1-x/1+x 在区间(-1,1)上为 递减 函数.求证!我证了是递增的,求导了再让导数大于0怎么都是增的啊,
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![一道数学函数单调性问题函数f(x)=ln 1-x/1+x 在区间(-1,1)上为 递减 函数.求证!我证了是递增的,求导了再让导数大于0怎么都是增的啊,](/uploads/image/z/12382057-1-7.jpg?t=%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E5%87%BD%E6%95%B0%E5%8D%95%E8%B0%83%E6%80%A7%E9%97%AE%E9%A2%98%E5%87%BD%E6%95%B0f%28x%29%3Dln+1-x%2F1%2Bx+%E5%9C%A8%E5%8C%BA%E9%97%B4%EF%BC%88-1%2C1%EF%BC%89%E4%B8%8A%E4%B8%BA+%E9%80%92%E5%87%8F+%E5%87%BD%E6%95%B0.%E6%B1%82%E8%AF%81%21%E6%88%91%E8%AF%81%E4%BA%86%E6%98%AF%E9%80%92%E5%A2%9E%E7%9A%84%2C%E6%B1%82%E5%AF%BC%E4%BA%86%E5%86%8D%E8%AE%A9%E5%AF%BC%E6%95%B0%E5%A4%A7%E4%BA%8E0%E6%80%8E%E4%B9%88%E9%83%BD%E6%98%AF%E5%A2%9E%E7%9A%84%E5%95%8A%2C)
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