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8 kg piersici.....18 kg mere.....102 lei 8 kg piersici.....27 kg mere.....129 lei 1 kg piersici=? 1 kg mere=?

Răspuns :

8p+18m=102 lei
8p+27m=129

8p+27m=129
8p+18m=102 lei    (-)
  8p-8p +27m-18m=129-102
9m =27 lei
m= 3 lei

daca m= 3 lei

8p+18m=102 lei
8p+18x3=102
8p+54=102
8p=102-54
8p=48
p=6 lei