Răspunsuri

2014-11-01T14:07:28+02:00
A+b=16 =>,a= 16-b=16-9=7 B+c=20 => c=20-b=20-9=11 C-a=18 A+2b+c=20+16 A+2b+c=36 2b=36-c-a 2b=36-18 2b=18 B=18:2=9