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

来源: jinjing 于 2009-12-30 18:42:54 [] [旧帖] [给我悄悄话] 阅读数 : (344 bytes)
回答: 回复：回复：有没有好办法？ 由 jinjing 于 2009-12-30 13:16:06

x c-63-t -x+t+63

c-t-47 t 47

x+t-63 63 -x+c-t

The sum of first column : x+c-t-47+x+t-63=c we get x=55.

If we know linear algebra well, We can let t=c=0 and get a rotational matrix: 55 -63 8
-47 0 47
-8 63 -55
Good luck. Happy new Year.

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