有大小相同的球若干個,全部的球可以擺成一個正方形,全部的球也可以擺成一個正三角形,兩種擺法如圖。若擺成正三角形,每邊球的個數比擺成正方形時每邊球的個數多2個,則球共有多少個? (A)81 (B

問題詳情

11.有大小相同的球若干個,全部的球可以擺成一個正方形,全部的球也可以擺成一個正三角形,兩種擺法如圖。若擺成正三角形,每邊球的個數比擺成正方形時每邊球的個數多2個,則球共有多少個?

(A)81
(B) 64
(C) 49
(D) 36。

參考答案

答案：D
難度：計算中-1
書單：沒有書單，新增

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