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2014-05-05T15:38:32+03:00
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
2 5 2
2014-05-05T15:38:35+03:00
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
1 5 1