Question

A+b+c=70
A+b=30
B+c=60
Afla a,b,c

Answer 1

a+b+c = 70
a+b = 30 --> 30 + c = 70 --> c = 70-30 --> c = 40
b+c = 60 --> a + 60 = 70 --> a = 70-60 --> a = 10
10+b+40 = 70 --> b = 70-10-40 --> b = 20

Answer 2

1)Daca a+b=30......il putem afla pe c=70-30=40        2) b+c=60......atunci a=70 -60=10     c)Ramane de aflat doar.....b    3)b=70-(40+10)=70-50=20...!Deci:a=10........b=20,iar c=40!Facem proba:10+20+40=70...Rezolvarea este corecta!