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有没有好办法？

cma 2009-12-30 08:21:09 ( reads)

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!

跟帖(7)

duo_duo

2009-12-30 11:52:24

回复：有没有好办法？

jinjing

2009-12-30 13:16:06

回复：回复：有没有好办法？

cma

2009-12-30 16:04:31

Yes. Do you have a fast and easy way to explain it?

innercool

2009-12-30 18:31:12

回复：Yes. Do you have a fast and easy way to explain it?

jinjing

2009-12-30 18:42:54

回复：Yes. Do you have a fast and easy way to explain it?

cma

2009-12-30 20:38:40

回复：有没有好办法？

cma

2009-12-30 20:39:40

多谢指教.