Question

afla c+b+a, daca:
a+b=236
b+c=632
a+c=708

Answer 1

a+b=236
b+c=632
a+c=708
se aduna toate
a+b+b+c+a+c=236+632+708
2a+2b+2c=1576
2(a+b+c)=1576
a+b+c=1576:2
a+b+c=788

Answer 2

a+b=236 => b=236-a
b+c=632
a+c=708 => a=708-c

b+c=632
c=632-b
c=632-(236-a)
c=632-[236-(708-c)]
c=632-(236-708+c)
c=632-236+708-c
c+c=1104
2*c=1104
c=1104:2
c=552

a=708-c
a=708-552
a=156

b+c=632
b=632-c
b=632-552
b=80

Verificare:
156+80=236
80+552=632
156+552=708

a+b+c= 156+80+552= 788