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有理数的运算,可根据题目的特点,使用一些技巧能方便运算,并使解题简捷。一、一定二求三和差在进行有理数加减运算时,第一步需确定和的符号,第二步再求加数的绝对值,第三步要分析确定绝对值相加还是相减。
The calculation of rational numbers can be based on the characteristics of the topic, using some techniques to facilitate the calculation and make the solution simple and easy. First, certain two seek three and difference In the rational addition and subtraction operation, the first step is to determine the sign of the sum, the second step to find the absolute value of the addend, the third step to analyze to determine the absolute value of the addition or subtraction.