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每第一個試子的(等號前面的式子)的第一個因數乘以1/2等於等號後面的式子的被減數;每一個等號前面的式子的第二個因數乘以二後被一除就等於等式後面的減數的值;所有等式都是等號前面為乘法運算,後面為減法運算;所…
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