Răspuns :
a+b+c=40 m
a=b+5 b=a-5
a=c-3 c=a+3
a+a-5+a+3=40
3a=40-3+5
3a=42
a=14 m
b=14-5=9 m
c=14+3=17 m
a=b+5 b=a-5
a=c-3 c=a+3
a+a-5+a+3=40
3a=40-3+5
3a=42
a=14 m
b=14-5=9 m
c=14+3=17 m