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在算盤上先撥出被乘數25,然後在算盤的最後面撥出乘數25,這兩個數位最好離遠一點,先用被乘數5最後以為乘以乘數最後一比特5,邊念口訣邊撥,“五五二十五”,得數撥在被乘數的後面(就是結果25的個位數5在被乘數的後面兩位…
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