教学人教版五年级上册《三角形的面积》之后,我发现教材中的练习题大多是利用面积计算公式,直接求面积,或者求高或底,而这些都是学生早就熟练掌握的内容。那么,在基础性学力之外,发展性学力、创造性学力如何兼顾?教材安排了一道练习题,在两条平行线中寻找面积相等的三角形(见下图),并画出与原三角形面积相等的三角形(见下图)。这道题背后隐藏的“等积变形”思想是图形与几何领域的重要思想方法之一,也是初中学习几何证明时 Teaching PEP fifth grade volumes “area of ​​the triangle”, I found that most of the exercises in the textbook is the use of area calculation formula, directly seeking the area, or seek high or bottom, and these are the students already mastered the content. Then, in addition to the basic academic ability, how to balance the development of academic ability, creative ability? Textbook arranged an exercise to find triangles of equal area in the two parallel lines (see below), and draw an area equal to the original triangle Triangle (see below). Hidden behind this question is the idea of ​​“isosceles” which is one of the important ways of thinking in the field of graphics and geometry. It is also a proof of learning geometry of junior high school