诺y=f(x)[0+无穷]上是增函数,f(xy)=xf(y)+yf(x),且满足f(x)+f(x-1/2)

题目

诺y=f(x)[0+无穷]上是增函数,f(xy)=xf(y)+yf(x),且满足f(x)+f(x-1/2)

答案

y=f(x)[0+无穷]上是增函数,f(xy)=xf(y)+yf(x),
令x=1,y=1 f(1)=f(1)+f(1)
f(1)=0
f(-xy)=xf(y)+yf(x)
=-xf(y)-yf(x)
=-f(xy)
所以函数为奇函数
f(x)+f(x-1/2)