Lời giải:
\(a+b=3\Rightarrow a+(b-2)=1\Rightarrow b-2=1-a\)
Ta có:
\(f(x)=\frac{9^x}{9^x+3}\Rightarrow f(a)=\frac{9^a}{9^a+3}\) (1)
\(f(b-2)=f(1-a)=\frac{9^{1-a}}{9^{1-a}+3}=\frac{9}{9^a\left(\frac{9}{9^a}+3\right)}\)
\(=\frac{9}{9+3.9^a}=\frac{3}{3+9^a}\) (2)
Từ (1),(2) suy ra \(f(a)+f(b-2)=\frac{9^a}{9^a+3}+\frac{3}{3+9^a}=\frac{9^a+3}{9^a+3}=1\)
Đáp án A