合24問題

2007-05-21 2:21 am
請對3,4,13,11進行四則運算〔+,-,×,÷和()〕,使結果等於 24:
(1):2,3,7,7
(2):4,10,10,11
(3):2,4,8,11
(4):4,5,9,11
(5):3,5,9,11
(6):2,7,12,12
(7):3,3,7,7
(8):4,9,11,12(必須列出二式)
(9):2,6,9,10(必須列出二式)
(10):4,8,11,11(必須用+)
(11):3,5,7,9(必須用+)
(12):5,9,12,12(必須用÷)
(13):x,x,y,y(為不同的偶數,且x<y,不能合成24)

回答 (3)

2007-05-21 2:40 am
✔ 最佳答案
(1)2x7+3+7

(2)11x4-10-10

(3)(11-2x4)x8

(4)I don't know

(5)I don't know

(6)12x(12+2)÷7

(7)7x(3+3÷7)

(8)12÷(11-9)x4and12÷4x11-9

(9)(9-10÷2)x6and(9-6)x(10-2)

(10)8÷4+11+11

(11)3+5+7+9

(12)(12x9+12)÷5

(13)(4,4,6,6)(6,6,10,10)(8,8,10,10)
參考: me
2007-05-21 2:40 am
(3) 2,4,8,11

(8÷4)x11+2=24


(11) 3,5,7,9

3+5+7+9=24
2007-05-21 2:30 am
參考: MYSELF


收錄日期: 2021-04-29 18:14:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070520000051KK04192

檢視 Wayback Machine 備份