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(x-3)!/(x-5)!<56 Help me !

Răspuns :

(x-3)!/(x-5)!<56
(x-5)!(x-4)(x-3)/(x-5)!<56
(x-4)(x-3)<56
x^2−7x+12<56
x^2−7x−44<0
(x+4)(x−11)<0
−4<x<11