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What are the mathematical equivalence relations in the second volume of the fourth grade of primary school?
Speed × time = distance, distance/speed = time, distance/time = speed.

Unit price × quantity = total price, total price/unit price = quantity, total price/quantity = unit price.

Single output × quantity = total output, total output ÷ quantity = single output, total output ÷ single output = quantity.

Efficiency × time = total work, total work/time = efficiency, total work/efficiency = time.

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