👤
Alexecatalin1
a fost răspuns

afla a, b,c daca: a+b=c a-b=b b+c=20

Răspuns :

a-b=b=>a=b+b=>a=2b=>a=2x5=>a=10
a+b=c=>2b+b=c=>c=3b=>c=3x5=>c=15
b+c=20=>b+3b=20=>4b=20=>b=20:4=>b=5

Alte intrebari