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Daca a+2b = 24
b+2c = 26
c+2a = 28
a+b+c = ?


Răspuns :

a+2b = 24
b+2c = 26 
c+2a = 28 
a+2b+b+2c+c+2a=24+26+28
3a+3b+3c=78
3(a+b+c)=78
a+b+c = 78/3
a+b+c = 26
[tex]a+2b+b+2c+c+2a=24+26+28[/tex]
[tex]3a+3b+3c=78[/tex]
[tex]3x(a+b+c)=78[/tex]
[tex]a+b+c=26[/tex]