(p3.)주산교재로 풀어보는 "5의덧셈"
Synopsis
10의보수를 이용한 5의 덧셈입니다. 일의자리에 5를 더할자리가 없을때, 십주판알 하나 올려주고 일의자리에서 5의보수 5를 빼주면 ...
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