有理数的混合运算涉及运算法则、运算顺序等知识,具有复杂、烦琐等特点.求解这类问题时很容易出错,很多同学对此感到头痛.怎样才能迅速观察出算式的结构特点并确定运算顺序呢?现在,刘老师向大家推荐几种方法.1.运算符号分段法.有理数的基本运算有加、减、乘、除、乘方等,其中加、减为第一级运算,乘、除为第二级运算,乘方为第三级运算.所谓运算符号分段法,就是根据不同级别的运算符号把式子分成若干段进行运算. Rational numbers of mixed operations involving algorithms, computing sequences and other knowledge, with complex, cumbersome, etc. Solving such problems is easy to make mistakes, many students feel a headache .How can we quickly observe the structure of the formula and determine the order of operations ? Now, Liu recommended to you a few ways .1 arithmetic symbol segmentation method. Rational numbers of the basic operations are addition, subtraction, multiplication, division, power, etc., plus, minus the first level operation, multiplication and division For the second level of operation, power for the third level operation.The so-called operation symbol segmentation method, is based on the different levels of operator symbols into the formula is divided into several paragraphs for computing.