Question

a+b=30
a+c=40
b+c= 50

aflati pe a , b ,c ? multumesc

Answer 1

A+b+c=30+40+50 A+b+c=120 C=120-30 =90 B=120-40 =80 A=120-50 =70

Answer 2

a+b=30  ⇒a=30-b

a+c=40

b+c=50  ⇒c=50-b

inlocuim pe a si c in ecuatia 2

30-b+50-b=40

-2b=-40, inmultim cu (-1)

2b=40

b=40:2

b=20

a=30-b

a=30-20

a=10

c=50-b

c=50-20

c=30