Răspunsuri

2014-08-12T17:00:28+03:00
A+b+c=50

b+4=a

b+7=c

b+4+b+b+7=50

3b+11=50

3b=50-11

3b=39

b=13

a=13+4=17
c=13+7=20
2014-08-12T17:15:27+03:00
A+b+c=50
B+4=a
b+7=c
B+4 + b +b + 7=50
3b+11=50
3b=50-11
3b=39
b=39:3
b= 13
a= 13+4=17
c=13+7=20
 acum proba
P:17+13+20=30+20=50