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Calculati 3x+5y+2z=? daca x+y=25 si y+z=24

Răspuns :

3x+3y+2y+2z=25×3+24×2=75+48=123
[tex]3x+3y+2y+2z=25x3+24x2 \\ =75+48 \\ =123[/tex]