f(xy)=f(x)+f(y),f(2)=1,f(3)=?
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f(xy)=f(x)+f(y),f(2)=1,f(3)=?
f(xy)=f(x)+f(y),f(2)=1,f(3)=?
f(xy)=f(x)+f(y),f(2)=1,f(3)=?
f(xy)=f(x)+f(y)
令x=2,y=1代入得
f(2)=f(2)+f(1)
f(1)=0
f(4)=f(2)+f(2)=2
f(x)+f(x-3)≤2
f[x(x-3)]≤2=f(4)
x(x-3)≤4
x^2-3x-4≤0
-1≤x≤4
结合题意得
0
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