有些同学在平时的学习中,常常因对某个知识内容没有理解或说理解模糊,而导致在利用该知识做题时存在理解上的偏差,结果出错.在老师订正后又恍然大悟!发出“啊,原来如此”般的感叹!笔者现对学生平时作业或考试中表现出来的常见的顽固性的错误,捡其几例加以说明澄清.望同学们今后不要再犯这样的失误. Some students in the usual learning, often because of a knowledge of the content did not understand or understand the fuzzy, resulting in the use of knowledge of the problem there is understanding of the deviation, the result of an error. Revised after the teacher suddenly realized! Issued Ah, the original "sigh! The author now usual work or test students show usual intractable mistakes, pick up a few examples to clarify. Hope students will not make such mistakes in the future.