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2014-02-18T15:32:34+02:00
Xyz=100x+10y+z;
xy=10x+y
deci xyz-xy-z=100x+10y+z-10x-y-z=90x+9y=9xy=cub perfect deci xy e 81 si z are orice valoare intre 0 si9
3 3 3