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In one go, the initial amount of the radioactive isotop 2019

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Description

In one go, the initial amount of the radioactive isotope decreased three times. How many times will it decrease in two years?

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Task 60519. Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
If you have any questions about the decision, write. I will try to help.

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