Question

a+b egal 20,a+c egal 24 ,b+c egal 10.cat este a+b+c?

Answer 1

a+b=20
a+c=24
b+c=10
⇒(adunam fiecare membru): 2a+2b+2c=20+24+10⇒
⇒2(a+b+c)=54⇔(a+b+c)=54:2⇒a+b+c=27