若非零函数f(x)对任意实数a,b均有f(a+b)=f(a)乘f(b),且当x大于零时,f(x)大于1(1)求证:f(x)大于零,(2)求证f(x)为减函数(3)当f(4)=1/16时,解不等式f(x-3)乘f(5-x平方)大于或等于1/4
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![若非零函数f(x)对任意实数a,b均有f(a+b)=f(a)乘f(b),且当x大于零时,f(x)大于1(1)求证:f(x)大于零,(2)求证f(x)为减函数(3)当f(4)=1/16时,解不等式f(x-3)乘f(5-x平方)大于或等于1/4](/uploads/image/z/2690535-39-5.jpg?t=%E8%8B%A5%E9%9D%9E%E9%9B%B6%E5%87%BD%E6%95%B0f%28x%29%E5%AF%B9%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0a%2Cb%E5%9D%87%E6%9C%89f%28a%2Bb%29%3Df%28a%29%E4%B9%98f%28b%29%2C%E4%B8%94%E5%BD%93x%E5%A4%A7%E4%BA%8E%E9%9B%B6%E6%97%B6%2Cf%28x%29%E5%A4%A7%E4%BA%8E1%281%29%E6%B1%82%E8%AF%81%3Af%28x%29%E5%A4%A7%E4%BA%8E%E9%9B%B6%2C%282%29%E6%B1%82%E8%AF%81f%28x%29%E4%B8%BA%E5%87%8F%E5%87%BD%E6%95%B0%283%29%E5%BD%93f%284%29%3D1%2F16%E6%97%B6%2C%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8Ff%28x-3%29%E4%B9%98f%285-x%E5%B9%B3%E6%96%B9%29%E5%A4%A7%E4%BA%8E%E6%88%96%E7%AD%89%E4%BA%8E1%2F4)
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