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原帖由 sss 於 2007-5-12 19:09 發表 如果所有都係正數: A x A = 100 --> A = 10 A + A + A = 30 = B + B --> B = 15 B + B + C = E --> 30 + C = E (1) C + D = E (2) (1) = (2) --> B + B + C = E = C + D --> 30 + C = ...