已知f(x)是定义在R上的函数求f(x)f(-x) f(x)绝对值f(-x) f(x)-f(-x) f(x)+f(-x)的奇偶性 抽象函数我怎么都想不通
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![已知f(x)是定义在R上的函数求f(x)f(-x) f(x)绝对值f(-x) f(x)-f(-x) f(x)+f(-x)的奇偶性 抽象函数我怎么都想不通](/uploads/image/z/1731001-49-1.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8R%E4%B8%8A%E7%9A%84%E5%87%BD%E6%95%B0%E6%B1%82f%28x%29f%28-x%29+f%28x%29%E7%BB%9D%E5%AF%B9%E5%80%BCf%28-x%29+f%28x%29-f%28-x%29+f%28x%29%2Bf%28-x%29%E7%9A%84%E5%A5%87%E5%81%B6%E6%80%A7+%E6%8A%BD%E8%B1%A1%E5%87%BD%E6%95%B0%E6%88%91%E6%80%8E%E4%B9%88%E9%83%BD%E6%83%B3%E4%B8%8D%E9%80%9A)
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