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Calculati numarul natural m,stiind ca:a)mn+mp=420si n+p=42. b)mn+mp=684 si n+p=57
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Răspuns :

a)mn+mp=420si n+p=42.
m(n+p)=420
m×42=420
m=420:10
m=10

 b)mn+mp=684 si n+p=57
m(n+p)=684
m×57=684
m=684:57
m=12