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有理数的四则运算是基本的运算,同时又是技巧性很强的运算.在学习这部分内容时,除了牢固掌握运算法则外,还要结合运算律掌握一些解题技巧,灵活运用一些解题方法,提高解题的速度和准确率,现举例说明.一、同号相结合同号结合是在有理数的加减混合运算时,将符号相同的数结合,即将正数与正数结合、负数与负数结合.通过同号结合不仅可以避免符号上的差错,而且使
Rational numbers of the four operations is a basic operation, but also a highly technical computing.When learning this part, in addition to firmly grasp the algorithm, but also with the operation law to grasp some of the problem-solving skills, the use of some flexibility to solve the problem , To improve the speed and accuracy of problem-solving, are an example.First, the combination of the same number The same number combination is a combination of rational numbers in the addition and subtraction, the same number of symbols combined, is about to combine positive and positive, negative and Combination of negative numbers. By combining the same number can not only avoid symbolic errors, but also