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怎樣說明1+1=2

Apr 30th 2014, 06:11

我記得有人說過這是數學十大難題之一，此應該稱為公理，也就是難以證明，但是大家都認為它是對的，公理跟定理不一樣喔。
或許可以這樣說明，桌上有一顆蘋果，加法就是把外面的蘋果再放上去，減法就是把桌上的蘋果拿出來，1+1就是桌上有一顆蘋果，再放上一顆，數一數桌上的蘋果有2顆，1+1=2。

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