[問題] 請問兩題數學的答案

看板GRE (GRE入學考試)作者 (噢)時間18年前 (2008/06/30 23:52), 編輯推噓3(3016)
留言19則, 5人參與, 最新討論串1/1
1.S is the sum of three consecutive integers,the greatest of which is x. In term if S,which if the following is the sum of three consecutive integers ,the least of which is x? (A) S-6 (B) S-3 (C) S+3 (D) S+6 (E) 2S Ans:D 2.Of the positive integers that are multiples of 30 and are less than or equal to 360,what fraction are multiples of 12? (A) 1/6 (B) 1/5 (C) 1/3 (D) 2/5 (E) 1/2 Ans:E 小弟想破頭就是想不出來... 想請板上的大大們幫我解答! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.136.212.102 ※ 編輯: a0939327899 來自: 220.136.212.102 (06/30 23:54)

06/30 23:54, , 1F
第一題 (x-2)+(x-1)+x=S 即S=3x-3
06/30 23:54, 1F

06/30 23:54, , 2F
後面一句是說用S表示三個連續的整數
06/30 23:54, 2F

06/30 23:55, , 3F
且最大為 x
06/30 23:55, 3F

06/30 23:55, , 4F
小 即 x+(x+1)+(x+2)
06/30 23:55, 4F

06/30 23:56, , 5F
3x+3 = S+6
06/30 23:56, 5F

06/30 23:57, , 6F
實在是答的不太好 不過希望你懂我的意思
06/30 23:57, 6F

06/30 23:57, , 7F
喔喔!我看懂了!最小改成x!謝謝你^^
06/30 23:57, 7F

06/30 23:58, , 8F
第二題說在小於等於360以內有幾個是30的
06/30 23:58, 8F

06/30 23:59, , 9F
倍數(360/30=12)然後在其中又有幾分之幾
06/30 23:59, 9F

06/30 23:59, , 10F
是12的倍數(360/60 要同時是30.12的倍數)
06/30 23:59, 10F

06/30 23:59, , 11F
第二題 1-360 能被 30 整除的數中 有幾
06/30 23:59, 11F

07/01 00:00, , 12F
所以答案是(6/12=1/2)
07/01 00:00, 12F

07/01 00:00, , 13F
分之幾是 12 的倍數
07/01 00:00, 13F

07/01 00:01, , 14F
XD 真不恰巧
07/01 00:01, 14F

07/01 00:01, , 15F
哈 原PO想必是來欣的
07/01 00:01, 15F

07/01 00:03, , 16F
被發現了= =
07/01 00:03, 16F

07/01 00:04, , 17F
感謝兩位替我解答^^我都看懂囉!
07/01 00:04, 17F

07/01 00:13, , 18F
哈 這不是上禮拜的魔考講解嗎
07/01 00:13, 18F

07/01 07:31, , 19F
第二題,1,2,3,4,6,12,6/12=1/2
07/01 07:31, 19F
文章代碼(AID): #18QG5Ig5 (GRE)
文章代碼(AID): #18QG5Ig5 (GRE)