小红姑姑家有一家油气厂,不久前小红去玩时发现了一段长374米的大型铁质空管,感到很好奇.
通常情况下,若y是关于x的函数,则y与x的函数关系式可记作y=f(x).如y=12x+3记作f(x)=12x+3,当x=2时,f(2)=12×2+3=4.下列四个函数中,满足f(a+b)=f(a)+f(b)的函数是( )
--- I hope Ted will be the winner.
--- But it ______ be him, because he has made so many mistakes.