在教学中,教师难免会出现笔下之错。这时如果能发挥自己的教学机智,灵活地处理,就可以将这些“错误”变为有助于课堂教学的素材,从而使数学课堂变得更加精彩。记得有一次数学测验,我就出现了一次笔下之错。有这样一个判断题:在一个三角形中,有两个角是锐角,它是一个钝角三角形 In teaching, teachers will inevitably appear the wrong writing. At this moment, if we can exert our own teaching tact and handle them flexibly, we can change these “mistakes” into the material that helps the teaching of the classroom so as to make the mathematics classroom become more wonderful. I remember there was a math test, I had a mistake in writing. There is such a problem: In a triangle, two corners are acute angles, it is an obtuse triangle