Teaching The Laws of Signs Kit

Braulio777
The device is based on a 2x4 decoder (74LS139) because this decoder shows a configuration that corresponds exactly in its inputs to the combination of signs of the operations of multiplication and division while its outpus give a result to each combination of inputs. Go to the following websites:
https://www.youtube.com/watch?v=lbvYyCkHG1k
http://www.instructables.com/id/Teaching-The-Laws-of-Signs-Kit/

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