新课标强调“课堂上要让学生动起来”。高效课堂以学生的学为出发点,关注学生知识的获得过程,重视学生学的过程和方法,即“以材定标,以生定导,以导领学,以学定教”。本文试探讨课堂教学有效生成需要把握的三原则:合理预设常量,机智应对变量,正确控制矢量。 The new curriculum emphasizes “class to make students move ”. Efficient classroom students to learn as the starting point, pay attention to the acquisition process of student knowledge, emphasis on student learning process and method, that is, “to materialize the standard, students to lead, to guide the learning, to learn to teach.” This article tries to discuss the three principles that need to be grasped in the effective production of classroom teaching: to reasonably preset the constant, to deal with the wit and to correctly control the vector.