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A+b+c=40
A=b+5
a=c-3
?A ?B ?C



Răspuns :

[tex]a+b+c=40 \\ a=b+5=\ \textgreater \ b=a-5 \\ a=c-3=\ \textgreater \ c=a+3 \\ a+a-5+a+3=40 \\ 3a=40+5-3 \\ a=42:3 \\ a=14 \\ b=14-5=9 \\ c=14+3=17[/tex]