已知f(x)是定义在【-1,1】上的奇函数,若a,b属于【-1,1】且a+b不等于0时,有{f(a)已知f(x)是定义在【-1.1】上的奇函数,当a,b属于【-1.1】且a+b不等于0,有 [f(a)+f(b)]/(a+b) > 0(1)证明f(x)在【-1,1】上为增
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![已知f(x)是定义在【-1,1】上的奇函数,若a,b属于【-1,1】且a+b不等于0时,有{f(a)已知f(x)是定义在【-1.1】上的奇函数,当a,b属于【-1.1】且a+b不等于0,有 [f(a)+f(b)]/(a+b) > 0(1)证明f(x)在【-1,1】上为增](/uploads/image/z/2558520-0-0.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8%E3%80%90-1%2C1%E3%80%91%E4%B8%8A%E7%9A%84%E5%A5%87%E5%87%BD%E6%95%B0%2C%E8%8B%A5a%2Cb%E5%B1%9E%E4%BA%8E%E3%80%90-1%2C1%E3%80%91%E4%B8%94a%2Bb%E4%B8%8D%E7%AD%89%E4%BA%8E0%E6%97%B6%2C%E6%9C%89%7Bf%28a%29%E5%B7%B2%E7%9F%A5f%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8%E3%80%90-1.1%E3%80%91%E4%B8%8A%E7%9A%84%E5%A5%87%E5%87%BD%E6%95%B0%2C%E5%BD%93a%2Cb%E5%B1%9E%E4%BA%8E%E3%80%90-1.1%E3%80%91%E4%B8%94a%2Bb%E4%B8%8D%E7%AD%89%E4%BA%8E0%2C%E6%9C%89+%5Bf%28a%29%2Bf%28b%29%5D%2F%28a%2Bb%29+%3E+0%EF%BC%881%EF%BC%89%E8%AF%81%E6%98%8Ef%28x%29%E5%9C%A8%E3%80%90-1%2C1%E3%80%91%E4%B8%8A%E4%B8%BA%E5%A2%9E)
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