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Narcisyon
a fost răspuns

daca 2a+3b=51c si 6a+b=81c determinati 3a+b=?

Răspuns :

Ioformaldeide


6a+b=81c il putem afla pe b=81c-6a, inlocuim in prima expresie 2a+3b=51c astfel

2a+3*(81c-6a)=51c   2a+243c-18a=51c   -16a=51c-243c  -16a=-192c a=12c

ne intoarcem la b=81c-6a b=81c-6*12c  b=81c-72c b=9c

3a+b=12c*3+9c=45c