48÷42=2 90÷74=3 91÷53=?
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48÷42=2 90÷74=3 91÷53=?
...48÷42=2. [(8-4)÷(4-2)]
90÷74=3. [(9-0)÷(7-4)]
91÷53=4. [(9-1)÷(5-3)]
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