我有一條數學問題問,急.................

2006-11-05 7:38 pm
一本書有200個頁碼,編上頁碼1,2,3,4.................
數字1在頁碼上中一共出現多少次??

回答 (3)

2006-11-05 7:49 pm
✔ 最佳答案
140次~
1-10:2
11-20:10
21-30/31-40/41-50/51-60/61-70/71-80/81-90:1
91-100:2
101-110:12
111-120:20
121-130/131-140/141-150/151-160/161-170/171-180/181-190:11
191-200:10
2006-11-05 8:02 pm
1x20
1_x20
+1_ _x100
so 140times
參考: my brain!!It works most of the times
2006-11-05 7:46 pm
冇計錯就39次
1,10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91,101,111,112,113,114,115,116,117,118,119,121,131,141,151,161,171,181,191

2006-11-10 21:37:38 補充:
我math好差
參考: me


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