Em tham khảo nha :
\(\begin{array}{l}
9)\\
\left\{ \begin{array}{l}
2{p_D} + {n_D} = 122\\
2{p_D} - \dfrac{{37}}{{24}}{n_D} = 0
\end{array} \right.\\
\Rightarrow {p_D} = {e_D} = 37;{n_D} = 48\\
10)\\
\left\{ \begin{array}{l}
2{p_T} + {n_T} = 180\\
{n_T} - {p_T} = 21
\end{array} \right.\\
\Rightarrow {p_T} = {e_T} = 53;{n_T} = 74\\
11)\\
\left\{ \begin{array}{l}
2{p_Z} + {n_Z} = 120\\
{p_Z} + {n_Z} = 84
\end{array} \right.\\
\Rightarrow {p_Z} = {e_Z} = 36;{n_Z} = 48\\
12)\\
\left\{ \begin{array}{l}
2{p_K} + {n_K} = 201\\
{p_K} - 0,66{n_K} = 0
\end{array} \right.\\
\Rightarrow {p_K} = {e_K} = 57,{n_K} = 86
\end{array}\)
