y=f(x)定义域(0,+∞)对于任意x,y∈(0,+∞)都有f(x-y)=f(x)+f(y)且x>1时f(x)都有f(x-y)=f(x)+f(y)改成都有f(xy)=f(x)+f(y)
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![y=f(x)定义域(0,+∞)对于任意x,y∈(0,+∞)都有f(x-y)=f(x)+f(y)且x>1时f(x)都有f(x-y)=f(x)+f(y)改成都有f(xy)=f(x)+f(y)](/uploads/image/z/5505839-71-9.jpg?t=y%3Df%28x%29%E5%AE%9A%E4%B9%89%E5%9F%9F%280%2C%2B%E2%88%9E%29%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8Fx%2Cy%E2%88%88%280%2C%2B%E2%88%9E%29%E9%83%BD%E6%9C%89f%28x-y%29%3Df%28x%29%2Bf%28y%29%E4%B8%94x%3E1%E6%97%B6f%28x%29%E9%83%BD%E6%9C%89f%28x-y%29%3Df%28x%29%2Bf%28y%29%E6%94%B9%E6%88%90%E9%83%BD%E6%9C%89f%28xy%29%3Df%28x%29%2Bf%28y%29)
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