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在计算四则混合式题时,学生往往有拿到题目就急于计算的习惯。他们以为只要按规定的运算顺序和计算法则去算总不会出错。殊不知,有许多四则式题里面都包含着能够简算的因素。如果拿到题目能先进行总体观察,分析出算式的结构特点;挖掘出能够简算的因素,灵活设计运算方法,则计算时往往能起到化繁为简、化难为易的作用。下面结合例题,谈谈如何进行四则混合式题的“妙解巧算”。
In calculating the four mixed questions, students often have the habit of getting the title eager to calculate. They think that as long as the prescribed order of operations and calculation of the law will not go wrong. As everyone knows, there are many four formula problems which can contain simple factors. If you can get the title of the first observation can be carried out to analyze the structural characteristics of the formula; dig out to be able to calculate the simple factors, flexible design of computing methods, the calculation can often play simplification, the difficulty of the role of ease. The following combination of examples to talk about how to carry out the four mixed questions “clever solution.”