这个正方体的棱长最大是多少厘米？

How long can the longest edge of the cube be?

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今天我们学习长方体、正方体的认识。

Today we'll learn about cuboids and cubes.

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一个正方体的棱长是5厘米，它的所有棱长之和是多少厘米？

The length of a cube is 5cm. What's the sum of all its edges ?

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