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因為被減數=減數+差,所以:388裏包含兩個被減數. 所以被減數=減數+差=388/2=194 194=減數+差減數比差大16,如果差新增16就和減數一樣多了 194+16=200就相當於兩個減數所以減數=200/2=100
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