Question

Mong mn giúpp emmm

Answer 1

BT1:

Ta có: \(\left\{{}\begin{matrix}P+N=24\\N=12\\E=P\end{matrix}\right.\Rightarrow E=P=24-N=24-12=12\)

BT2:

Ta có: \(\left\{{}\begin{matrix}P+E+N=22\\P=E\\P+E-N=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}P=E=7\\N=8\end{matrix}\right.\)

BT3: 

Ta có: \(\left\{{}\begin{matrix}P+E+N=24\\\dfrac{N}{P+E+N}.100\%=33,33\%\\P=E\end{matrix}\right.\Leftrightarrow P=E=N=\dfrac{24}{3}=8\)

BT4:

Ta có: \(\left\{{}\begin{matrix}P+E+N=34\\N-P=1\\P=E\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}P=E=11\\N=12\end{matrix}\right.\)