我们选择一次方程组的教学当作直接点明化归观念的突破口,其根据如下:第一,化归观念确实在一次方程的教学中起着主导作用;第二,经过一元一次方程等章节的教学,学生已经具备初步建立化归观念的知识基础和思维基础。一般说来,在突破阶段的教学中,要在利用数学观念解决具体问题的基础上,借题发挥,浓彩重墨地对某个数学观念作正面的介绍,让学生形成强烈的印象。在此教学阶段,教师围绕着观念所作的讲解处于十分重要的地位。下面是我们的教学安排: We choose to teach the system of equations as a direct point of understanding to break through the concept of a breakthrough, based on the following: First, the return of the concept does play a leading role in the teaching of an equation; second, after a unitary equation and other chapters Teaching, students already have the initial establishment of the concept of knowledge base and thinking of the foundation. Generally speaking, in the teaching of the breakthrough stage, we should make use of mathematical concepts to solve specific problems and give them positive explanations on some mathematical concepts in order to make students form a strong impression. During this teaching phase, teachers' explanations around the concept are very important. Here is our teaching arrangement: