
求第3题(1)(2)过程及答案 50
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(1)
(7! - 5!)/4! = (7*6*5! - 5!)/4! = (42 - 1)5!/4! = 41*5 = 205
(2) (n+1)!/n! - n!/(n - 1)! = (n+1)*n!/n! - n*(n-1)!/(n-1)! = n+1 - n = 1
(7! - 5!)/4! = (7*6*5! - 5!)/4! = (42 - 1)5!/4! = 41*5 = 205
(2) (n+1)!/n! - n!/(n - 1)! = (n+1)*n!/n! - n*(n-1)!/(n-1)! = n+1 - n = 1
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