84. A piece of wire of length / is cut into two portions of lengths x and
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84. A piece of wire of length / is cut into two portions of lengths x and (1-x). Each portion is then cut into twelve equal parts which are soldered together so as to form the edges of a cube.
Find an expression for the sum of the volumes of the two cubes so formed.
What is the least value of the sum of the volumes?
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