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Daca ab + ac = 207 si b + c = 23, atunci a =...

Răspuns :

ab+ac=207
b+c=23
a(b+c)=207
ax23=207
23a=207
a=207:23
a=9
a(b + c) = 207
b + c = 23
23 * a = 207
a = 207 : 23
a = 9