回复：做题。 (图)

来源: calligraphy 于 2010-04-16 20:18:01 [旧帖] [给我悄悄话] 本文已被阅读：次

1X1: 2(n-1).
2X2: (n-2)
sqrt(2)xsqrt(2): (n-2).
n=19.

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