已知函数f(x)对任意实数x、y都有f(xy)=f(x)*f(y),且f(-1)=1,f(27)=9,当0=
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![已知函数f(x)对任意实数x、y都有f(xy)=f(x)*f(y),且f(-1)=1,f(27)=9,当0=](/uploads/image/z/1487689-25-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%E5%AF%B9%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0x%E3%80%81y%E9%83%BD%E6%9C%89f%28xy%29%3Df%28x%29%2Af%28y%29%2C%E4%B8%94f%28-1%29%3D1%2Cf%2827%29%3D9%2C%E5%BD%930%3D)
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