The cross section of a rectangular square steel is a square with a side length of 4cm, and the square steel is 3.2m long. If the weight of steel per cubic decimeter is 7.8kg, how many kg does the square steel weigh?

4*4/100*（3.2*10）*7.8
=39.936 KG

A 12 - decimeter - long wire is used to form the largest Cube - shaped frame with a volume of () cubic decimeters

The sum of the edges of this cube is 12, and the edge length is 12 decimeters
Edge length = 1 decimeter
The volume of this cube is one cubic decimeter

A 12 decimeter long iron wire is used to form a frame in the shape of the largest cube. The volume of the cube is______ Cubic decimeter

The volume of this cube is 1 cubic decimeter

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