Question

Aflati trei numere naturale a,b,c, care verifica simultan egalitatile a+b=28, b+c=16 si c+a=20.

Answer 1

2 (a+b+c)=28 +16 +20
2 (a+b+c)=64
a+b+c=64 ÷2=32
a+b=28
28 +c=32 c=32 -28 =4
b+c=16
a+16 =32 a=32 -16 =16
c+a=20
20 +b=32 b=32 - 20 =12
16 +12 +4= 32