\(a,\)Ta có : \(L=3,4.\dfrac{N}{2}\Rightarrow N=3000\left(nu\right)\)
- Do đó ta có hệ : \(\left\{{}\begin{matrix}2A+2G=3000\\2A+3G=3900\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}A=T=600\left(nu\right)\\G=X=900\left(nu\right)\end{matrix}\right.\)
\(b,\) Ta có : \(M=300.N=900000(đvC)\)