13题求解急!!!
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(1)
x1=x2=1
f(1)= f(1) + f(1)
f(1) =0
(2)
x1=x2=-1
f(1)= f(-1) + f(-1)
=>f(-1) =0
x1=x, x2=-1
f(-x) = f(x) + f(-1)
f(-x)= f(x)
=> f 偶函数
(3)
f(4)=1
f(x-1)<2
f(x) is increasing on ( 0, +∞)
x1=x2 = 4
f(16) = f(4)+f(4)
f(16) = 2
f(x-1)<2
f(-16)<f(x-1)<f(16)
-16<x-1<16
-15<x< 17
x1=x2=1
f(1)= f(1) + f(1)
f(1) =0
(2)
x1=x2=-1
f(1)= f(-1) + f(-1)
=>f(-1) =0
x1=x, x2=-1
f(-x) = f(x) + f(-1)
f(-x)= f(x)
=> f 偶函数
(3)
f(4)=1
f(x-1)<2
f(x) is increasing on ( 0, +∞)
x1=x2 = 4
f(16) = f(4)+f(4)
f(16) = 2
f(x-1)<2
f(-16)<f(x-1)<f(16)
-16<x-1<16
-15<x< 17
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