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aratati ca numerele C³₈₋C²₉₋ 4 ESTE PASTRAT PERFECT

Răspuns :

[tex] \frac{8!}{3!5!} - \frac{9!}{2!7!}-4= \frac{5!*6*7*8}{5!*6}- \frac{7!*8*9}{7!*2}-4= \\ =7*8-4*9-4=56-36-4=16=4^2 [/tex]