Question

Daca m+n=15 si n+p=45, calculati 2m+4n+2p. Va rog rezolvare completa! Multumesc!

Answer 1

m + n= 15
n + p = 45
m + 2n + p = 60
2m +4 n + 2p =
2 ( m + 2n + p ) =
2 x 60 = 120

Answer 2

$\displaystyle m+n=15| \cdot 2 \Rightarrow 2m+2n=30 \\ n+p=45| \cdot 2 \Rightarrow 2n+2p=90 \\ 2m+2n+2n+2p=30+90 \\ 2m+4n+2p=120$