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根據a+b=c,b+c=d,d+a=b,可以把a、b、d當成未知數,c為參數,得 a= -c b= 2c d= 3c 所以(a+b)(b+c)(c+d)(d+a)=24c^4(c的四次幂) 又因為c是正整數,所以原式最小值為24
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