The growth rate of aquatic plants is doubling every day. It is understood that this kind of water grass has grown half a pond in five days. How many days can it grow a pond?
3. A square with a side length of 2 has five points. It is proved that the distance between at least two of these five points is not greater than the root number 2.
4. Prove that any function whose definition domain is symmetrical about the origin can be written as the sum of a odd function and an even function.
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