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在新课标中,教材不是唯一的课程资源,但作为主要的课程资源,我们不能忽视它在课堂教学中的地位和作用.同一本教材、同一个内容,如何讲出自己的风格,从而让学生更好地感受课程的内涵?笔者从以下几个方面加以阐述,希望能起到抛砖引玉的效果.1 抓住定理或公式的特征进行延伸案例1 当我们通过创设情境把平方差公式(a+b)(a-b)=a~2-b~2的结构特点讲清楚之后,提问学生:(x-1)(x~2+1)(x+1)=?生:先把(x~2+1),(x+1)两式按乘法交换率交换位置,再两次使用平方差公式.即(x-1)(x~2+1)(x+1)=(x-1)(x+1)(x~2+1)=(x~2-1)(x~2+1)=x~4-1.
In the new curriculum standard, teaching materials are not the only curriculum resources, but as the main curriculum resources, we can not ignore its status and role in the classroom teaching. The same textbook, the same content, how to tell their own style, so that Students better feel the content of the course? The author elaborated in the following aspects, hoping to play a valuable role.1 grasp the characteristics of the theorem or formula to extend Case 1 When we create the situation by the square deviation formula (a + b) After the structural characteristics of a ~ 2-b ~ 2 are clear, ask the student: (x-1) (x ~ 2 + 1) (x + 1) (X + 1) (x + 1) = (x-1) + 1) (x + 1) The two equations are swapped at the multiplicative exchange rate and the square error formula is used twice. (x + 1) (x ~ 2 + 1) = (x ~ 2-1) (x ~ 2 + 1) = x ~ 4-1.