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a fost răspuns

a)Daca b+c= -73 si ab+ac= -876,atunci a=...<br />
b)Daca b-c=15 si ab-ac= -510,atunci a=...<br />
c)Daca a= -27 si ab+ac= -837,atunci b+c=...

Răspuns :

A) b+c= -73;  ab+ac=a(b+c) => a(b+c)= -876 => a= -876/ -73=12 a=12;
B) b-c=15 a(b-c)= -510 => a= -510/15= -34  a= -34;
C) a= -27  a(b+c)= -837 => b+c= -837/-27 = 31  b+c=31;

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