在学习教科书(江科版)九年级(上)第四章“一元二次方程”第三节“用一元二次方程解决问题”第一课时时,完成了例题的教学后,我补充了一道练习题,其中第(1)(2)小题在课堂上完成,第(3)小题我有意作为课后思考题留给学生课下完成,并讲明在下节课上新课前花几分钟时间处理.题目如下:已知竖直上抛的物体离地面高度h(米)和抛出时 In the study textbook (Jiang Ke) ninth grade (on) the fourth chapter “quadratic equation ” “third ” with a quadratic equation to solve the problem "the first class hour, completed the teaching of examples, I added a practice question, in which the first (1) (2) quiz is completed in the classroom, the third quiz (I) is intended to be left for students after class to complete the lesson, and states that in the next class new Spent a few minutes before class to deal with. The title is as follows: The object is known to be thrown vertically from the ground height h (m) and when thrown