f(x)是定义在R上得函数且对任意的x、y都有f(x+y)=f(x)+f(y)-1成立当x>0时,f(x)>1.(1)证明:f(x)在R上是增函数.(2)若f(4)=5,求f(2);(3)若f(4)=5,解不等式f(3m²-m-2)
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![f(x)是定义在R上得函数且对任意的x、y都有f(x+y)=f(x)+f(y)-1成立当x>0时,f(x)>1.(1)证明:f(x)在R上是增函数.(2)若f(4)=5,求f(2);(3)若f(4)=5,解不等式f(3m²-m-2)](/uploads/image/z/12662366-14-6.jpg?t=f%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8R%E4%B8%8A%E5%BE%97%E5%87%BD%E6%95%B0%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84x%E3%80%81y%E9%83%BD%E6%9C%89f%28x%2By%29%3Df%28x%29%2Bf%28y%29-1%E6%88%90%E7%AB%8B%E5%BD%93x%3E0%E6%97%B6%2Cf%28x%29%3E1.%EF%BC%881%29%E8%AF%81%E6%98%8E%EF%BC%9Af%28x%29%E5%9C%A8R%E4%B8%8A%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0.%282%29%E8%8B%A5f%284%29%3D5%2C%E6%B1%82f%282%29%3B%283%29%E8%8B%A5f%284%29%3D5%2C%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8Ff%283m%26%23178%3B-m-2%29)
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