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a+b+c=198,b-c=123atunci 2a+b+3c=?

Răspuns :

a+b+c=198
b-c=123=>b=123+c
a+123+c+c=198
a+2c=75/+(a+b+c)
2a+b+3c=75+198=273.
Sper ca te am ajutat!:)