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Ip. x + y= z
x = 3y
z= numarul natural\( \overline{abbb} \) ; cu suma cifrelor 15; a,b nr consecutive...

Cc. x, y, z= ?

Cf http://mateforum.ro/viewtopic.php?t=2451[b] z = 3444 [/b]=>

=> 3y + y = 3444
=> 4y = 3444
= > y = 861

x = 3444 - 861
x = 2583