Question

a+b=10
b+c=20
a+c=24
a+b+c=
​

Answer 1

2a+2b+2c=10+20+24

2a+2b+2c=54

a+b+c=54:2

a+b+c=27

Answer 2

Răspuns:

$a+b = 10\\\\b+c = 20\\\\a+c = 24\\\\a+b+b+c+a+c=10+20+24\\\\2a+2b+2c= 10+20+24\\\\2a+2b+2c=54\\\\a+b+c=54:2\\\\a+b+c=27$