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9又5/7-(2又1/13+4又5/7+11/13) =9又5/7-2又1/13-4又5/7-11/13 =9又5/7-4又5/7-(11/13+2又1/13) =5-2又12/13 =2又1/13 這樣的題,要先用交換律、結合律,先算同分母相加减,
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