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Un article trouvé pour ce sujet.
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Two problems |
2010-04-13 |
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Dorothy pose la question :
1. Explain why the number 123, 456, 789, 101, 112 cannot be a perfect square. (Hint: What is the units digit?)
2. A substance doubles in volume every minute. At 9:00A.M., a small amount is placed in a container. At 10:00A.M., the container is just full. At what time was the container one-eighth full?
Robert Dawson lui répond. |
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