设函数y=f(x)是定义在(O,正无穷)上的函数,对定义域内的任意x,y都满足f(xy)=f(x)+f(y)
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推荐于2016-12-01
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f(2)=1
f(4) = f(2*2) = f(2) + f(2) = 2
f(x)+f(x-3)<=2 = f(4)
f(x(x-3)) <= f(4)
x^2 -3x -4 <=0
-1 <= x <= 4
f(4) = f(2*2) = f(2) + f(2) = 2
f(x)+f(x-3)<=2 = f(4)
f(x(x-3)) <= f(4)
x^2 -3x -4 <=0
-1 <= x <= 4
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