1 设f(x)是定义在(0,+∞)上的增函数,并且对任意的x>0,y>0,f(xy)=f(x)+f(y)总成立.求f(1)的值2 已知f(x)= -3²-3x+18(1)当x∈R时,写出函数的单调区间,并求出函数的最大值(2)当函数f(x)的定义域是
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![1 设f(x)是定义在(0,+∞)上的增函数,并且对任意的x>0,y>0,f(xy)=f(x)+f(y)总成立.求f(1)的值2 已知f(x)= -3²-3x+18(1)当x∈R时,写出函数的单调区间,并求出函数的最大值(2)当函数f(x)的定义域是](/uploads/image/z/5367569-41-9.jpg?t=1+%E8%AE%BEf%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8%EF%BC%880%2C%2B%E2%88%9E%EF%BC%89%E4%B8%8A%E7%9A%84%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E5%B9%B6%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84x%3E0%2Cy%3E0%2Cf%28xy%29%3Df%28x%29%2Bf%28y%29%E6%80%BB%E6%88%90%E7%AB%8B.%E6%B1%82f%281%29%E7%9A%84%E5%80%BC2+%E5%B7%B2%E7%9F%A5f%28x%29%3D+-3%26sup2%3B-3x%2B18%EF%BC%881%EF%BC%89%E5%BD%93x%E2%88%88R%E6%97%B6%2C%E5%86%99%E5%87%BA%E5%87%BD%E6%95%B0%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E5%87%BD%E6%95%B0%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%EF%BC%882%EF%BC%89%E5%BD%93%E5%87%BD%E6%95%B0f%28x%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E6%98%AF)
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