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解答有理数的计算题时,灵活运用运算律,常能避繁就简,变难为易,提高解题的速度和准确率.一、巧用加法的交换律和结合律进行有理数的加法运算,或加减混合运算时,巧用加法的交换律和结合律,应注意如下几点:1.把正数和负数分别相加;2.把互为相反数,或相加得零的数先相加;3.把可以凑成整数的数相加;4.把同分母,或分母有倍数关系的数结合相加;5.把整数、小数、分数分别相加;6.把小数化成分数,或把分数化成小数,或
To solve rational numbers of computational questions, the flexibility to use the law of operations, often to avoid complex problems, difficult as easy to improve the speed and accuracy of problem-solving. First, clever use of the addition of the law of exchange and the law of rational addition, Addition and subtraction hybrid operation, the clever use of the addition of the exchange law and the law of convergence should be noted that the following points: 1. The positive and negative were added; 2. The number of each other the opposite, or zero added to the first phase Add the number that can make up the integer add up; 4 put the same denominator, or the denominator multiples of the number of the combination of the sum; 5 integer, decimal, fractional addition; 6 decimal fraction, Or divide the score into decimals, or