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國中數學問題:一題而已~
Sep 21st 2013, 04:28

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想問這題數學問題,我會算但是不知道有沒有更快的方法? (x+1)(x^2-x+1)+(x-1)(x^2+x+1)=_______ 請給解釋,感恩!!!^^...
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