不少学生认为解应用题时要认真审题,四则混合运算就没有什么“题”好审了。因此,在计算四则混合运算时,只粗略地看一下题目就动笔计算。如5.8+0.2-5.8+0.2这样一道校为简单的混合运算式题,由于题中数字和运算符号的干扰,有的学生计算结果为0。这就是由于没有认真审题,只想到“简便运算”,随意改变题目的运算顺序而造成错误。又如3.14×4.6+7.2×3.14-3.14×1.8题中,数据较大,计算麻烦,学生往往只知按运算顺序提笔 Many students think that solution should be seriously examining questions, four mixed computing is no problem. Therefore, in the calculation of four mixed computing, only a rough look at the topic to calculate the pen. Such as 5.8 + 0.2-5.8 +0.2 such a school for the simple hybrid arithmetic expression, due to the problem of numbers and symbols of the interference, some students calculate the result of zero. This is because without careful examination, only think of “easy operation”, arbitrarily change the subject of the operation sequence and cause errors. Another example is the 3.14 × 4.6 +7.2 × 3.14-3.14 × 1.8 questions, the data is larger, the calculation is troublesome, students often only know in order of operation to mention pen