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综观近两年全国各省 (市 )的中考题 ,围绕“因式分解”一章的内容 ,展示了如下三种常见的题型。1.概念型试题例 1.下列由左边到右边的变形 ,属于因式分解的是 ( )( A) ( x+1) ( x- 1) =x2 - 1;( B) x2 - 2 x+1=x( x- 2 ) - 1;( C) a2 - b2 =( a+b) ( a- b) ;( D) mx+my+nx+
Looking at the examination questions in various provinces (municipalities) of the country in the past two years, the following three common types of questions are presented around the contents of the “factor factorization” chapter. 1. Conceptual test cases Example 1. The following left-to-right variants are factored into () (A) (x+1) (x- 1) =x2 - 1; (B) x2 - 2 x+ 1=x( x- 2 ) - 1;( C) a2 - b2 =( a+b) ( a- b) ;( D) mx+my+nx+