- Ta có : \(T^2-X^2=\left(T-X\right)\left(T+X\right)=12\%\)
- Mà \(T+X=50\%=\dfrac{1}{2}\left(1\right)\)
\(\rightarrow\)\(\left(T-X\right).50\%=12\%\rightarrow T-X=\dfrac{6}{25}\left(2\right)\)
Từ \((1),(2)\) ta có hệ : \(\left\{{}\begin{matrix}T+X=\dfrac{1}{2}\\T-X=\dfrac{6}{25}\end{matrix}\right.\rightarrow\left\{{}\begin{matrix}A=T=37\%\\G=X=13\%\end{matrix}\right.\)
ta có: T2-X2=12%
⇒(T-X)(T+X)=12%
mà T+X=50%
⇔T-X=12%/50%=6/25
xét:\(\left\{{}\begin{matrix}T-X=\dfrac{6}{25}=24\%\\T+X=50\%=\dfrac{1}{2}\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}T=37\%\\X=13\%\end{matrix}\right.\)
mà A=T=37%
G=X=13%