Data and electricity course design: circuit of full adder / subtractor

I did a full adder and subtractor circuit last semester in my freshman year

With the two 3-8 Decoder and two 7420、 One 7432

Because I think it is too simple after simplification , In a different way . Make sure the teacher sees it .

ppt There is a detailed process on

This is the circuit we designed

If necessary +v zyl200366

To design a good circuit （EWB）+ppt（ Because each school does not fill in the report by itself ）

notes ： If another circuit software used by the teacher can be connected according to the gourd drawing