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教师提问要做到“四要”、“四不”。“四要”即:一要善于“引路”、“架桥”。比如教圆柱体的侧面积,要抓住它与长方形面积的本质相同这一点,把两者联系起来。可以提出如下问题:(长方形卷成)圆筒的侧面积与长方形的面积有什么关系?长方形的长变成了圆筒的什么?宽变成了什么?圆筒的侧面积怎样计算?这样,学生很快能推导出圆柱体侧面积的计算公式。二要击中要害。如
Teachers ask questions to be “four to”, “four no.” “Four to” that is: one should be good at “lead the way”, “bridge.” For example, to teach the side of the cylinder area, to grasp it and the rectangular area of the essence of the same point, to connect the two. The following questions can be asked: (Rectangular roll into) What is the relationship between the side area of the cylinder and the area of the rectangle? What is the length of the rectangle into a cylinder? What is the width? What is the side area of the cylinder? Students can quickly deduce the formula for calculating the area of the cylinder. Second, hit the key. Such as