Question

Va rog . produsul a două nr este 672.mărind unul dintre ele cu 10 produsul devine 992.

Answer 1

x-primul numar
y-al doilea numar
$\left \{ {{xy=672} \atop {(x+10)y=992}} \right. \\ \left \{ {{xy=672} \atop {xy+10y=992}} \right. \\ \left \{ {{xy=672} \atop {672+10y=992}} \right. \\ \left \{ {xy=672} \atop {10y=992-672}} \right. \\ \left \{ {{xy=672} \atop {10y=320}} \right. \\ \left \{ {{xy=672} \atop {y=32}} \right. \\ \left \{ {{32x=672} \atop {y=32}} \right. \\ \left \{ {{x=672:32} \atop {y=32}} \right. \\ \left \{ {{x=21} \atop {y=32}} \right.$