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The sixth grade elementary school mathematics exercise book the first equation problem (not a thinking question)
Solution: Let the forged square steel be x meters long.

0.8*0.8*0.8=0. 16x

0.5 12=0. 16x

x=0.5 12/0. 16

x=3.2

A: The forged square steel is 3.2 meters long.

Note: length = volume/bottom area