在最近举行的泉州市教学比赛中,选题之一是:多项式乘以多项式,抽到该题的参赛选手,教学流程基本上是复习旧知——单项式乘以多项式的法则,探索新知——利用图1面积的不同表达式来得到多项式乘以多项式的法则.以下是选手们的教学流程:赋予图2一个实际背景,然后计算图2面积,S=ab.由图2补形得到图3,再计算图3的面积,S=b(a+n)或S=ab+nb, In the recent teaching contest in Quanzhou, one of the topics is: Polynomials multiplied by polynomials, drawn to the contestants, the teaching process is basically to review the old - monomial multiplication polynomial rules, to explore new knowledge - Figure 1 The area of ​​different expressions to get the polynomial multiply polynomial rules. The following are the players of the teaching process: given an actual background in Figure 2, and then calculate the area of ​​Figure 2, S = ab. Recalculate the area of ​​Figure 3, S = b (a + n) or S = ab + nb,