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VA ROG FRUMOS SA MA AJUTATI!!!!DAU COROANA!!!!!
Stiind ca: x+2y=51 si y+3z=100 , aflati:5x+12y+6z.
VAAAAAAA ROOOOOOOG!!!!


Răspuns :

x+2y=51
y+3z=100

5x+12y+6z=
5x+10y+2y+6z=
5(x+2y)+2(y+3z)=
5*51+2*100=
255+200=
455