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se tie ca x+y=23 si z=15 calculati xz+yz



Răspuns :

xz+xy=z(x+y)=15(23)+ 15x23=345
[tex]\displaystyle x+y=23 \\ z=15 \\ xz+yz=z(x+y)=15 \cdot 23=345 \\ \boxed{xz+yz=345}[/tex]