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stiind ca a+ b + c=13 calculeaza:a)3a+3b+3c;b)5a+5b+5c+12;c)10a+10b+10c-100;d)11a+11b+11c+309;e)1000-(25a+25b+25c);f)a+(b+c).daca y =11,determina produsul b=(14y)*(13-y)*(12-y). va rog rezultate plzzz CLS 3