1.设f（x）=ax+b,则2f（x）-f（-x）=2ax+2b-（-ax+b）=3ax+b=x+1,则a=1／3,b=1f（x）=1／3x+12.设f（x）=ax+b,f（f（x））=a（ax+b）+b=27x-26,则a^2=27,ab+b=-26,a=3√3,b=1-3√3f(x)=3√3x+1-3√3...
1、若2f（x）-f（-x）=x+1,求f（x）
1.设f（x）=ax+b,则2f（x）-f（-x）=2ax+2b-（-ax+b）=3ax+b=x+1,则a=1／3,b=1f（x）=1／3x+12.设f（x）=ax+b,f（f（x））=a（ax+b）+b=27x-26,则a^2=27,ab+b=-26,a=3√3,b=1-3√3f(x)=3√3x+1-3√3...