课堂教学要“以纲据本,立足课本”已成共识.纵观近几年的各省、地、市的中考题,这些题大都紧扣大纲,源于教材,但又不是照搬原有教材,充分说明了它的重要性.因此,我们应在平时课堂教学中,注重挖掘课本例、习题的各种潜能,适当地编拟一些习题,一方面能拓宽学生解题思路,激发学生兴趣,另一方面也能培养学生的探究能力.本文以课本一道习题为例,适当地进行变式,进一步培养学生的探究能力,以期抛砖引玉. Classroom teaching has become a consensus based on textbooks and textbooks. Throughout the examination questions of provinces, prefectures and cities in recent years, most of these questions are closely related to the outline and originate from the teaching materials, but they are not copying the original teaching materials. It fully explains its importance. Therefore, we should pay attention to tapping the various potentials of textbook examples and exercises in the ordinary classroom teaching. We should appropriately formulate some exercises. On the one hand, we can broaden the students’ problem-solving ideas and inspire students’ interest. On the one hand, it can also cultivate the student’s inquiry ability. This article takes a textbook as an example and appropriately carries out variants to further cultivate students’ inquiry ability, with a view to attracting valuable comments.