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2019ҵλְ⿼Աɣԭ

2019-05-23 16:08:30| й

2019ҵλƸڽŵı׶ΣΪ˰λܹõıսҵλԣйΪ׼ҵλְ⿼Դ⼼ɣԭϣλܼʱ鿴һ֮

һԪȿ

УЩԪλҪױվһλ;еλԪҪһλֻվ׻ҡʱӦȰԪػλá

Ӷ濼

ֱӿǣҪֳɺۣܶĶֻһֻʱǿȻٽȥͿˡ

תΪֱ

һ㿼ֱϵ˳УҲһЩڻϵ˳⡣ֱȣûǰβ֣֮ʱֻҪһԪΪףͿ԰ѻתΪֱ⡣

nΧһȦͬз=(n-1)!()

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2019ҵλƸϢ

2019ҵλƸְ⿼

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