推 thepiano :原式=(n+1)(n^4+n^3+n^2+n+1) 09/17 15:38
→ thepiano :[n^2+(n/2)]^2<n^4+n^3+n^2+n+1<[n^2+(n/2)+1]^2 09/17 15:38
→ thepiano :n^4+n^3+n^2+n+1=[n^2+(n/2)+(1/2)]^2,解n 09/17 15:39
※ 編輯: dora2402 來自: 140.112.247.245 (09/18 02:07)
→ dora2402 :抱歉本來用手機看沒看清楚QQ 感謝樓上的解答:) 09/18 02:08