Răspuns :
a+b=508
b+c=528
a+b+c=777 =>(a+b=508) 508+c=777 =>c=269
b+c=528 =>b=528-269 =>b=259
a+b=508 =>a=508-259 =>a=249
b+c=528
a+b+c=777 =>(a+b=508) 508+c=777 =>c=269
b+c=528 =>b=528-269 =>b=259
a+b=508 =>a=508-259 =>a=249
a+b=508⇒b=508-a
b+c=528⇒c=528-b=528-508+a=20+a
a+b+c=777⇒a+508-a+20+a=777⇒528+a=777
a=777-528=249
b=508-249=259
c=20+249=269
b+c=528⇒c=528-b=528-508+a=20+a
a+b+c=777⇒a+508-a+20+a=777⇒528+a=777
a=777-528=249
b=508-249=259
c=20+249=269