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這道題是沒有簡便方法的(沒有可以套用的公式),不嫌麻煩的話可以用計算接按一按得出答案是:-131/164 這要是暑假作業的話,可以這樣寫: 原式=-1+2*(1/11+1/110+1/1640)=-1+33/164=-131/164
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