00266nam a22000977a 450000500170000000800410001702000150005804000080007324500530008126000340013420200831124354.0200831b           ||||| |||| 00| 0 eng d  a0719543029  cCML  aUnderstanding Mathematics 4.cCox, C.J & Bell, D  aLondonbJohn Murray Ltdc1986