00000nz  a2200000n  4500
001  KSH1998004029
005  20000215231021
008  980429 n azknn|abn          |a a|a    | 
150  ▼a간약 법칙[簡約法則]▲
450  ▼wr▼i영어▼acancellation law▲
550  ▼wg▼a곱셈▲
550  ▼wg▼a덧셈▲
550  ▼a결합 법칙[結合法則]▲
550  ▼a교환 법칙[交換法則]▲
550  ▼a분배 법칙[分配法則]▲