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(a-b)的二次方乘(a-b)的n次方乘(b-a)的五次方 n為奇數(a-b)的二次方乘(a-b)的n次方乘(b-a)的五次方=-(a-b)^(7+n) n為偶數(a-b)的二次方乘(a-b)的n次方乘(b-a)的五次方=(a-b)^(7+n)
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