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選取2出來,括弧內是x除以(2x加2)然後2乘進去,整體變為x除以(x加1)即1减1除(x加1),把所有的1提出,後面的是差比數列的倒數,貌似採用錯位相减吧,你試試看,俺的數學差,過來混分的,望採納.
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