數學 數學 數學 數學 數學 有多少個數字?

2010-04-15 5:11 am
3,6,9,12,15,18......450 ,由3去450一共多少個數字?

回答 (6)

2010-04-15 5:24 am
✔ 最佳答案
將450除以3
即等於150

因為3,6,9,12,15,18......450
是3*1,3*1,3*3,3*4.......3*150

所以共有150個數字
參考: me
2010-04-16 9:36 pm
這條問題是含糊的,造成2種理解 :

1) 12算一個數字 , 450也算一個數字。答案 = 150

2) 12算兩個數字 , 450算三個數字。答案 = 414
2010-04-16 7:28 am
To 螞蟻雄兵:
(12,15,18,…,99)=>2*(4,5,6,…,33)=>2*(33-4+1)=60
It should be
(12,15,18,…,99)=>3*(4,5,6,…,33)=>3*(33-4+1)=90
Besides, I think your answer is not correct...
2010-04-15 5:34 am
是咪3既倍數?
3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,102,105,108,111,114,117,120,123,126,129,132,135,138,141,144,147,150,153,156,159,162,165.168,171,174,177,180,183,186,189,192,195,198,201,204,207,210,213,216,219,222,225,228,231,234,237,240,243,246,249,252,255,258,261,264,267,270,273,276,279,282,285,288,291,294,297,300,303,306,309,312,315,318,321,324,327,330,333,336,339,342,345,348,351,354,357,360,363,366,369,372,375,378,381,384,387,390,393,396,399,402,405,408,411,414,417,420,423,426,429,432,435,438,441,444,447,450

150個數字
2010-04-15 5:27 am




3,6,9,12,15,18,.....,450 ,由3去450一共多少個數字?

Sol

3,6,9,12,15,18,.....,450

=>3,6,9,12,15,18,…,99,102,......,450

=>(3,6,9),(12,15,18,…,99),(102,105,…,450)

(3,6,9)=>3

(12,15,18,…,99)=>2*(4,5,6,…,33)=>2*(33-4+1)=60

(102,105,108,….,450)=>3*(34,35,36,…,150)=>3*(150-34+1)=351

3+60+351=414





2010-04-15 5:17 am
一百五十個字
這是一名數學天才潘濠軒,告訴我的,有興趣可以add他msn
參考: 自己


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