《数学课程标准》指出:“要关注学生在数学活动中所表现出来的情感与态度,帮助学生认识自我,建立自信心”。学习错误是一种来源于学习活动本身,直接反映学生学习情况的生成性教学资源。在教学活动中,学生的错误是不可避免的。一般情况下,只要学生经过思考,其错误中总会包含某种合理的成份,有的甚至隐藏着一 The standard of mathematics curriculum states: “We should pay attention to students’ emotions and attitudes expressed in mathematics activities and help students to recognize themselves and build their self-confidence.” Learning error is a kind of generative teaching resource that comes from the learning activity itself and directly reflects the learning of students. In teaching activities, students’ mistakes are inevitable. Under normal circumstances, as long as the students after thinking, the error will always contain some reasonable ingredients, and some even hide a