设函数f(x)的定义域为(-3,3),且对任意x,y都有f(x)-f(y)=f(x-y),当x<0时,f(x)>0,f(1)=-2设函数f(x)的定义域为(-3,3),且对任意x,y都有f(x)-f(y)=f(x-y),当x0,f(1)=-2 .(1)求f(2)的值,判断f(x)的单调性并
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![设函数f(x)的定义域为(-3,3),且对任意x,y都有f(x)-f(y)=f(x-y),当x<0时,f(x)>0,f(1)=-2设函数f(x)的定义域为(-3,3),且对任意x,y都有f(x)-f(y)=f(x-y),当x0,f(1)=-2 .(1)求f(2)的值,判断f(x)的单调性并](/uploads/image/z/3019165-61-5.jpg?t=%E8%AE%BE%E5%87%BD%E6%95%B0f%28x%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%28-3%2C3%29%2C%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8Fx%2Cy%E9%83%BD%E6%9C%89f%28x%29-f%28y%29%3Df%28x-y%29%2C%E5%BD%93x%26lt%3B0%E6%97%B6%2Cf%28x%29%26gt%3B0%2Cf%281%EF%BC%89%3D-2%E8%AE%BE%E5%87%BD%E6%95%B0f%28x%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%28-3%2C3%29%2C%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8Fx%2Cy%E9%83%BD%E6%9C%89f%28x%29-f%28y%29%3Df%28x-y%29%2C%E5%BD%93x0%2Cf%281%EF%BC%89%3D-2+.%EF%BC%881%EF%BC%89%E6%B1%82f%EF%BC%882%EF%BC%89%E7%9A%84%E5%80%BC%2C%E5%88%A4%E6%96%ADf%EF%BC%88x%EF%BC%89%E7%9A%84%E5%8D%95%E8%B0%83%E6%80%A7%E5%B9%B6)
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