“以直代曲”在微积分中是最基本、最朴素的思想方法,在新的课程准标中也被提到了相当的高度,因此,新教材中(如苏教版必修②及选修2-2)安排了丰富的例题和习题,旨在引导学生体会“无限逼近”、“量变到质变”与“近似与精确”的哲学原理,为教师和学生的活动提供了广阔的思维空间,以期促 “To direct song ” in calculus is the most basic and most simple way of thinking, in the new curriculum standards have also been referred to a considerable height, therefore, the new textbook (such as the Soviet version of compulsory ② and Elective 2-2) Arranged a wealth of examples and exercises designed to guide students to understand the philosophy of “infinite approximation ”, “quantitative change to qualitative change ” and “approximate and precise ” philosophy for the activities of teachers and students Provide a vast space of thought, with a view to promote