Răspuns :
a [...........] 2
b [...........]......]
c [...........]...2....]...2..]
15-6=9
9:3=3(a)
3+2=5(b)
3+4=7(c)
v: 3+5+7=15
b [...........]......]
c [...........]...2....]...2..]
15-6=9
9:3=3(a)
3+2=5(b)
3+4=7(c)
v: 3+5+7=15