Răspunsuri

2014-10-17T21:05:57+03:00
A+b+c=57
2a+b+2c=73
le scadem : a+c=73-57=16
2a+b+2c=73|*2 =>
=> 4a+2b+4c=146
     a+c=16
le adunam ultimele doua:
5a+2b+5c=146+14=160
(a+c)(5a+2b+5c)=16*160=2560