a) N = Cx 20 = 180 x 20 = 3600 (nu)
l = N x 3,4 : 2 =6120 Ao
b) A - G = 20%
A + G= 50%
=> A = T = 35% N = 1260 (nu)
G= X = 15%N = 540 (nu)
a,L=C.34=4080(Å)b,\(N=20.C=2400\left(nu\right)\)\(\Rightarrow20\%.N==480\left(nu\right)\)
Theo bài ra ta có hệ:\(\left\{{}\begin{matrix}A-G=480\\2A+2G=2400\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}A=T=840\left(nu\right)=35\%N\\G=X=360\left(nu\right)=15\%N\end{matrix}\right.\)