数值计算问题在中学代数各章中均有涉及,但地位并不突出,这往往使人产生“数值计算”在初等代数教学过程中容易解决、没有多少技巧的错觉。这种错觉是十分有害的,它使人们往往只注意到数值计算的准确性,而忽视了数值计算中的技巧及某些规律。事实上,有很多数值问题是很难解决的,例如人们已证明了2~2~8+1是合数,却至今尚未找到它的一个真因数。况且 The problem of numerical calculation is involved in all chapters of middle school algebra, but its status is not prominent. This often leads to the illusion that “numerical calculations” are easy to solve in the process of elementary algebra teaching and do not have much skill. This illusion is very harmful, it makes people often only pay attention to the accuracy of numerical calculations, while ignoring the skills and certain laws in numerical calculations. In fact, there are many numerical problems that are difficult to solve. For example, people have proved that 2~2~8+1 are composite numbers, yet they have not yet found a true factor. Moreover,