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把1/ [(2n-1)(2n)] = -1/(2n)+ 1/(2n-1) b1= -1/2 + 1/1 b2= -1/4 + 1/3 b3= -1/6 + 1/5 b4= -1/8 + 1/7 無解.題目有沒有寫錯呢?
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