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沒答案的 令,a,b,c,d,e,f,g,h,i為未知的1~9; 有a-b=c;d-e=f;g+h=i; 則:a=b+c;d=e+f;i=g+h; -> a+d+i = b+c+e+f+g+h 因為:a+b+c+d+e+f+g+h+i=45 則:a+d+i=45/2而a,d,i是整數 所以題目無解!
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