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数学选择填空解题的四大误区总结;
时间:2018年12月30日

数学选择填空解题的四大误区总结;
 
 
选择/填空题非常重要
 
  首先,在考试当中做选择题的正确率很大程度上影响你的总成绩,特别是成绩好的同学,如果选择题错一个就是遗憾,错两个就提前宣告了你在这次考试中难以得到高分。对于成绩一般的同学而言,选填题占了大部分基础分啊。
 
  其次,做选择题速度的快慢直接影响你能否做完后面的解答题,最终也直接影响你的总成绩。
 
  比如:
 
  一个中等生,做完12个选择题花30-35分钟是正常的,超过了就说明还需加快。
 
  如果是一个优秀学生,就必须在25分钟之内(快的可在20分钟内)完成。
 
  大家可以计算一下,考试时间一共才120分钟,如果前面 已经花了50-60分钟在选择题上面,那么做完填空题后也就没啥时间做解答题了。也就是说,花了120分钟做了80分的题,就算100%正确都还是没及格。
 
  
 
  高考数学家选择填空解题误区
 
  误区一:轻视选填题
 
  主要表现在这些题挺简单,随便算算就可以。
 
  对策:
 
  做选择题时,除了按照解答题的思路直接来求以外,还要注意一些特殊的方法,比如说直接法,特殊值法,代入法,排除法,验证法,数形结合法等等。
 
  选择题的解题方法还有很多,做题时不要太拘泥于固定思维,有时候一道题可采用多种特殊方法综合运用。
 
  误区二:审题不清,误入陷阱
 
  对策:
 
  在做选择题的过程中,遇到关键性的词语可用笔做个记号,以引起自己的注意,比如说至少,没有一个,至多一个等等。
 
  第一遍没做的题也要做个记号,但要注意与其它记号区分开来,这样不容易遗漏。
 
  误区三:做选题题时间太短或太长
 
  对策:
 
  按照高考数学卷面的时间分配,最好将选择题、填空题控制在30分钟~50分钟内完成。
 
  数学成绩好的学生应该在30分钟左右完成,差一些的学生应该在50分钟左右完成,一般来说,在选择题、填空题上学生应平均用40~45分钟之间完成比较合理。这样,才能为后面的6道大题留出充裕的时间。
 
  误区四:只重能力题,忽视基础题
 
  对策:
 
  成绩较好的同学往往喜欢把精力放在选题最后的两个能力题上,花了大量的时间运算和思考,导致14个基础题没有时间来检验,所以得分率不高。
 
  这种“丢了西瓜捡了芝麻”的行为,一定要引起注意。
 
  首先,前后题目一样都是5分,对比而言,基础题做好要容易的多;再次,能力题解题套路太多,常规方法很难完全做出,对于选择题,还可以采用代入法、排除法、特殊值法等。
 
 
 
 
Choosing/filling in blanks is also very important.
 
 
 
First of all, the correct rate of choosing questions in the examination has a great impact on your overall results, especially the students with good grades. If one of the choosing questions is wrong, it is a pity that two mistakes announce in advance that you are difficult to get high marks in this examination. For students with average grades, the selection of questions accounts for most of the basic points.
 
 
 
Secondly, the speed of choosing questions directly affects whether you can finish the following answers, and ultimately also directly affects your overall results.
 
 
 
For example:
 
 
 
It is normal for a middle school student to spend 30-35 minutes on 12 choice questions, which means that it needs to be accelerated.
 
 
 
If you are a good student, you must finish it in 25 minutes (fast in 20 minutes).
 
 
 
You can calculate that the exam time is only 120 minutes. If 50 - 60 minutes have been spent on the choice of questions, then there will be little time to answer the questions after completing the blank. That is to say, it took 120 minutes to do 80 points of the problem, even if 100% correct still failed.
 
 
 
 
 
Misunderstandings of Mathematicians in College Entrance Examination in Choosing to Solve Questions by Filling in the blanks
 
 
 
Myth 1: Despising the Selection of Subjects
 
 
 
The main manifestation is that these questions are quite simple and can be calculated casually.
 
 
 
Countermeasures:
 
 
 
In choosing questions, besides solving them directly according to the way of thinking, we should also pay attention to some special methods, such as direct method, special value method, substitution method, exclusion method, verification method, number-shape combination method and so on.
 
 
 
There are many ways to solve the problem of choice. Don't be too rigid in fixed thinking when doing the problem. Sometimes a problem can be used by a variety of special methods.
 
 
 
Misconception 2: Misunderstanding the topic and falling into the trap
 
 
 
Countermeasures:
 
 
 
In the process of choosing questions, when encountering key words, you can mark them with a pen to attract your attention, for example, at least none, at most one, and so on.
 
 
 
The first time you don't do it, you should also make a mark, but you should pay attention to distinguishing it from other marks, which is not easy to miss.
 
 
 
Myth 3: Too short or too long time to choose a topic
 
 
 
Countermeasures:
 
 
 
According to the time allocation of the mathematics papers in the college entrance examination, it is better to control the selection and filling in the blanks in 30 to 50 minutes.
 
 
 
Students with good math scores should finish in about 30 minutes, while those with poor math scores should finish in about 50 minutes. Generally speaking, it is reasonable for students to finish in an average of 40-45 minutes in choosing and filling in the blanks. In this way, enough time can be set aside for the following six major problems.
 
 
 
Misconception 4: Focusing only on ability questions and neglecting basic ones
 
 
 
Countermeasures:
 
 
 
Students with better grades tend to concentrate on the last two ability questions, and spend a lot of time calculating and thinking. As a result, 14 basic questions have no time to test, so the score rate is not high.
 
 
 
This behavior of "losing watermelon and picking up sesame" must be noticed.
 
 
 
Firstly, both the front and back questions are 5 points. By contrast, it's much easier to do the basic questions well. Thirdly, there are too many ways to solve the ability questions, so it's difficult to complete the conventional methods. For the choice questions, we can also use the substitution method, exclusion method, special value method and so on.
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