函数f(x)的定义域是(0,正无穷大),当x>1时,f(x)
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函数f(x)的定义域是(0,正无穷大),当x>1时,f(x)<0,f(x.y)=f(x)+f(y),证明f(x)是减
f(x.y) = f(x)+f(y)
令y=1+r(r>0),则f(xy)=f(x+rx) = f(x)+f(1+r)
函数f(x)的定义域是(0,正无穷大),当x>1时,f(x)<0,f(x.y)=f(x)+f(y),证明f(x)是减
f(x.y) = f(x)+f(y)
令y=1+r(r>0),则f(xy)=f(x+rx) = f(x)+f(1+r)