dau coreoana!!!!!!!!!!!!!

Răspuns:
.c1/+1/5=k=c1= k/5
c2=,k= 6,3
c3=k/7,5
k/5+k/7,5=105
3k+2k=105×15
5k=105×15=k=105×3=315
c1=315/5=63
c2=315/6,3=50
c3=315/7,5=42