一、缘起——从讲解到探究为了优化育人模式,推进课改理念,我校在全校各班开设研修课堂,研修课堂的授课老师由各班班主任聘请.笔者有幸被高三(1)班聘为数学研修课堂的授课教师,每周六安排一次研修课,时间为2个连续课时,上课的方式以数学的问题探究为主.本文展示就是笔者最近一次研修课的课堂记录.一上课,笔者就抛出如下问题:问题1若集合A1,A2满足A1∪A2=A,则称(A1,A2)为集合A的一种分拆,并规定:当且仅当 First, the origin - from explain to explore In order to optimize the mode of educating people, to promote the concept of curriculum reform, our school opened in all classes in the school training class, teacher training class hired by the class teacher. For the mathematics training class teacher, arranged for a training class every Saturday, time is 2 consecutive classes, the way the class to explore the main mathematical problems.This article shows is the author of a recent class lesson record .A class, the author It throws the following problem: Question 1 If A1, A2 satisfy A1∪A2 = A, then (A1, A2) is a kind of spin-off of set A, and provides that if and only if