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Cum simplific expresia: 9! - 8! .


Răspuns :

! = cardinal ( numarul de numere dintr-o expresie )

!= nr factorial
9! =1.2.3......8.9
8! = 1.2.3......8
9!-8! = 1.2.3.......8.9 - 1.2.3......8 = 1.2.3.......8 ( 9-1)= 1.2.3...8 x8