a+b+c=563
b=2×a+2
c=(b-a)÷2=>c=(2a+2-a)÷2
=>c=(a+2)÷2=>c=a÷2+1
a+2a+2+a÷2+1=563
a+2a+a÷2=563-(2+1)=>a+2a+a÷2=563-3
=>a+2a+a÷2=560/×2
=>2a+4a+a=1120
=>7a=1120
=>a=1120÷7
a=160
=>b=2×160+2
b=320+2
b=322
=>c=(322-160)÷2
c=162÷2
c=81
verificare
_________
160+322+81=563
482+81=563
Răspuns: a=160; b=322; c=81
