三中三计算公式视频

简介：Looking through the window, you can see the scene inside. There are all senior high school students sitting here. Teacher He Jun is teaching mathematics on the podium. In that inconspicuous corner, there is a boy and girl. The boy looks very ordinary. , lowered his head and was doing his homework seriously. The girl was a little naughty and pushed him with her elbow, asking him to copy the homework.