Câu trả lời:
Ta có : A\(_{\left(x\right)}\)=a2+bx+c
A\(_{\left(1\right)}\)=a+b+c=6
Theo đề bài ta có :
\(\dfrac{a}{3}=\dfrac{b}{2}=c\) (a,b,c\(\ne\)0)
\(\Rightarrow\dfrac{a}{3}=\dfrac{b}{2}=c=\dfrac{a+b+c}{3+2+1}=\dfrac{6}{6}=1\)
Do vậy \(\dfrac{a}{3}=1\Rightarrow a=3\)
\(\dfrac{b}{2}=1\Rightarrow b=2\)
c=1
Vậy a=3, b=2, c=1