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根据题目给定的条件和要求添运算符号和括号,没有固定的法则。解决这类问题,一般的方法有试验法、凑数法、倒推法。如果题目中的数字比较简单,可以采用试验的方法找到答案:如果题目中的结果比较大,可以把数字先分组,然后每组再试验。凑数法常用于题目中数字不太多、结果较复杂的时候。这时要先凑出一个与结果较接近的数,然后再对算式中剩下的数字作适当的安排,即增加或减小,使等式成立。
According to the subject given the conditions and requirements Tim operator symbols and parentheses, there is no fixed law. To solve such problems, the general method of test law, make up the number of law, the law against. If the number of questions is simple, you can use the experimental method to find the answer: If the results in the topic is relatively large, you can group the numbers first and then retest each group. The number of tricks often used in the title number is not too much, the result is more complicated. In this case, we should first draw a number closer to the result and then make the appropriate arrangements for the remaining numbers in the formula, that is, increase or decrease so that the equation holds.