Report copyright - 박성선 춘천교육대학교 - KOCWcontents.kocw.net/.../document/2015/cnue/parkseongseon/1.pdf · 2016-09-09 · 1이 적으면 15 8+7=15 7+7=14 그래서 1이 많으면 15 8+7=15
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