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1/3+3/5+5/7+7/9+9/11 =3/3+5/5+7/7+9/9+1/11 = 這題可以把所有的分數的分子相互交換,這樣可以凑成4個1和一個1/11. 4又1/11 +11/13=4.0897324897325
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