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有理数的加法是有理数运算的开始,对整个有理数运算的学习起着非常重要的作用,对于加法法则中运用绝对值来决定和的符号与和的结果,学生感到困难,难以理解、接受。但当把法则做了小改动,回避了绝对值,学生就容易接受了。
The addition of rational number is the beginning of rational number operation, which plays a very important role in the learning of the whole rational number operation. Students find it hard to understand and accept the result of using absolute value to determine the sum of sign and sum in addition law. But when the law made a small change, to avoid the absolute value, the student is easy to accept.