010.기초주산(보수 있는 운주법)#abacus
Synopsis
보수가 있는 수들의 문제풀이 연습입니다. * 오늘의 핵심 * 더할 수 없을 땐 앞자리 올리고 보수 빼주고 =================== [ 셈쌤 ...
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