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qiu zhi wen ti de te shu jie fa
Pages: 40-42
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Abstract: <正>一、凑零代入法例1 已知 ,则a4-2a3-4a2+1=______. 解由 ,得 .平方、整理,得a2-2a-4=0. ∴原式=a2(a2-2a-4)+1=a2·0+1=1. 二、整体代入法 .
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