初中数学有理数的运算难度大于小学阶段所学的加减乘除的计算。增加了负号、乘方及零指数幂和负整指数幂的运算,运算顺序和方法有了一定的变化。有的初中生学习计算知识,计算方法不过关,成天都好像在写算,就是算不对,写不清楚,似是而非,也浪费了太多精力。为什么,因为他们没有读懂题,也没有搞清顺序和方法,当然就做不来,做不对,当然也没有时间学习分析其他题型知识,考试也难于得到较为理想的分数。那么老师该如何帮 The arithmetic difficulty of junior middle school mathematics is more than that of the arithmetic of addition, subtraction, multiplication and division in elementary school. An increase of the negative sign, power and zero exponential exponential power and negative integer exponential operation, the operation sequence and method has changed. Some junior high school students learn computational knowledge, calculation methods, however, customs, all day writing seems to count, is not right, not clear, plausible, but also wasted too much energy. Why, because they did not read the problem, did not find the order and method, of course, can not do, right, of course, did not have time to learn other types of knowledge, the exam is difficult to get the ideal score. How can teachers help?