I v_____ my grandmother on Sunday morning.咋填?

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• 问一道数学函数题啊函数f(x)是定义在（0,+无穷）上的减函数,对任意的x,y属于（0,+无穷）,都有f(x+y)=f(x)+f(y)-1,且f(4)=5.(1)求f(2)(2)解不等式f(m-2)f(2)=3,f(4)=5和条件不符合啊，不是减函数了？第2个这样解对吗？f(m-2)=f(m-4+2)=f(m-4)+f(2)-1=4我想问f(1+0)=f(1)+f(0)-1成立吗？