有沒有好辦法？

來源: cma 於 2009-12-30 08:21:09 [] [舊帖] [給我悄悄話] 閱讀數 : (235 bytes)

The sum of the number in each line, column and diagonal in the 3x3 "magic
square" bellow is always constant. Only two numbers are visible.
Which number is missing in field a?

a x x
x x 47
x 63 x

Thanks!

所有跟帖： 

• 回複：有沒有好辦法？ -duo_duo- ♀ 給 duo_duo 發送悄悄話 (2 bytes) () 12/30/2009 postreply 11:52:24

• 回複：回複：有沒有好辦法？ -jinjing- ♀ 給 jinjing 發送悄悄話 (38 bytes) () 12/30/2009 postreply 13:16:06

• Yes. Do you have a fast and easy way to explain it? -cma- ♂ 給 cma 發送悄悄話 (66 bytes) () 12/30/2009 postreply 16:04:31

• 回複：Yes. Do you have a fast and easy way to explain it? -innercool- ♀ 給 innercool 發送悄悄話 innercool 的博客首頁 (259 bytes) () 12/30/2009 postreply 18:31:12

• 回複：Yes. Do you have a fast and easy way to explain it? -jinjing- ♀ 給 jinjing 發送悄悄話 (344 bytes) () 12/30/2009 postreply 18:42:54

• 回複：有沒有好辦法？ -cma- ♂ 給 cma 發送悄悄話 (9 bytes) () 12/30/2009 postreply 20:38:40

• 多謝指教. -cma- ♂ 給 cma 發送悄悄話 (0 bytes) () 12/30/2009 postreply 20:39:40

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