[計量] The 20 people at a party are ...

看板GRE作者時間15年前 (2008/10/23 22:23), 編輯推噓12(12推 0噓 21→)
留言33則, 6人參與, 最新討論串1/2 (看更多)
一次問了蠻多題，先謝謝大家了 1. y= x+ 1/x 0<x<10 The value of y 100 答案為 D 2. 0<x<y<1 1-y y-x 答案為 D 3. 0 < p < 1 The greatest value of p(1-p) 1/2 答案為 C 4.S is the sum of the first n negative integer powers of 2; i.e., S=2-1+2-2+…+2-n s 1 答案為 B 5.The 20 people at a party are divided into n mutually exclusive groups in such a way that the number of people in any group does not exceed the number in any other group by more than 1 The value of n if at 6 least one of the groups consists of 3 people 答案為 D 6. For a project, a square piece of cloth is folded in half and sewed together to form a rectangle that has a perimeter of 36 centimeters, What was the area in square centimeters of the piece of cloth before it was folded? (A) 16 (B) 36 (C) 81 (D) 108 (E) 144 答案為 D 7. How many positive 4-digit integers begin (on the left) with an odd digit and end with an even digit? (A) 250 (B) 500 (C) 2,000 (D) 2,500 (E) 5,000 答案為 D -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.169.56.215
推
10/23 22:27, , 1F
1. 想像 x = 1/100
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10/23 22:28, , 2F
2. 想像x跟y都很接近0 和 都很接近1
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3. 配方法
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10/23 22:30, , 4F
4. 無窮項和的公式 0.5 / (1-0.5) = 1
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10/23 22:30, , 5F
7. 4位數中 千位為奇數 個位為偶有??個
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10/23 22:30, , 6F
可是s是有限項 所以不會到1
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10/23 22:32, , 7F
7. 5*10*10*5
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10/23 22:33, , 8F
(1,3,5,7,9)*(0~9)*(0~9)*(0,2,4,6,8)
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推
10/23 22:33, , 9F
5. 44444這樣分的話只有5組 但
10/23 22:33, 9F
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10/23 22:34, , 10F
3333332這樣分卻有7組 所以無法確定跟6比
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10/23 22:34, , 11F
的大小
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10/23 22:41, , 12F
謝謝各位大大的解答
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10/23 22:41, , 13F
另外想請問第3題要怎麼配數字？
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推
10/23 22:46, , 14F
那個...第三題答案應該是b吧XD
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10/23 22:47, , 15F
剛沒有細看 配方最後是代p = 1/2
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10/23 22:47, , 16F
所以左邊是1/4
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10/23 22:47, , 17F
還有第六題的答案怎麼好像是e的感覺
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10/23 22:53, , 18F
我也覺得第三題答案是B.可是給的解答是C..
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推
10/23 22:55, , 19F
第六題我也算E...
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推
10/23 22:55, , 20F
天阿～這幾題怎麼這麼難...我連題目都不
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10/23 22:55, , 21F
太懂得感覺耶(緊張)可不可以解釋一下^^"
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10/23 23:07, , 22F
我第六題也算E...
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10/23 23:07, , 23F
剛google了一下
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10/23 23:08, , 24F
http://tinyurl.com/5ou9zn 所以答案是b
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10/23 23:10, , 25F
然後那題答案也的確是e的樣子
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10/23 23:11, , 26F
折一半的周長=36 原來周長=36 * 4/3 = 48
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10/23 23:11, , 27F
所以面積是12*12=144
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推
10/23 23:13, , 28F
第五題的意思: 20人分n組, 每組跟其他組
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10/23 23:14, , 29F
差距最多一人 比較至少有一組3人以上的n 6
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6. 方布折一半變成矩型 周長36 原來面積=?
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10/23 23:15, , 31F
7. 有多少個4位數最左邊數字奇數 最右邊偶
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10/23 23:18, , 32F
喔喔～謝謝！這樣第七題懂了XDD
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10/24 11:01, , 33F
謝謝C大 W大 D大的解答與幫忙^ ^
10/24 11:01, 33F
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文章代碼(AID): #1908Zvlu (GRE)
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文章代碼(AID): #1908Zvlu (GRE)