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Alibec11
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rezolva urmatoarele cerinte: a) afla numarul a daca ab + ac =520 si b+c=52. b) afla numarul a daca ab-ac =45 si b-c=9 c) afla suma b+c daca ab+ac+-70=170 si a = 25 d) afla diferenta b-c daca ab-ac-48 = 2 si a = 10

Răspuns :

Agretta
a)ab+ac=520,b+c=52
a(b+c)=a·52=520⇒a=10

b)ab-ac=45,b-c=9
a(b-c)=a·9=45⇒a=5

c)b+c=?,ab+ac-70=170,a=25
a(b+c)-70=170⇒a(b+c)=100,25·(b+c)=100⇒b+c=4

d)b-c=?,ab-ac-48=2,a=10
a(b-c)-48=2⇒a(b-c)=50,10(b-c)=50⇒b-c=5

sper ca e ok :))

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