[tex] \\ \\ 1.
x-banii-Anei \\
y-banii-Mariei \\
x=2y \\
x=? \\ y=? \\
\left \{ {{x=2y} \atop {x+y=456}} \right. \\
\left \{ {{x=2y} \atop {2y+y=456}} \right. \\
\left \{ {{x=2y} \atop {3y=456}} \right. \\
=\ \textgreater \ y=152euro \\ =\ \textgreater \ x=152*2=304euro \\
2. (10+5)-[(7*1,5)+(5*0,75)]= \\
=15-(10,5+3,75)=15-14,25=0,75lei(75bani) \\
3.x-sezlong-uri \\ y-umbrele \\ 12mese \\
x=4y=\ \textgreater \ x+y+12=113=\ \textgreater \ x+y=101=\ \textgreater \ 4y+y=101 \\
=\ \textgreater \ 5y=101=\ \textgreater \ 101- nu- se- imparte- la- 5[/tex]
