真是快呀,幸亏昨晚没犯懒,把今年中考题从头到尾做了一遍,今天一早这个解析就出来了。
今年中考题比往年是简单了一些,估计今年满分学生会很多,但是作为普通学生来讲想拿满分还是不太容易的,就犹如今年初一期末题一样,这不光与平时的解题训练有关,还有学生的做题素质、考试素质也是息息相关的。会有相当一部分学生会因为定势思维、审题时想当然而丢分,如初一期末中周同学画图题中的两条垂线就想当然的画了一条射线和一条直线导致99分的遗憾,韩同学也是因为最后一题的一个小小的范围导致98分的遗憾,所以平时的教学。。。。。再比如车同学的计算错误就丢了6分导致成为了全班倒数第四的成绩,非常之遗憾
今年的中考题虽然简单但是不平庸,出题目很亲民,给分给得很到位之外,函数体可以说是出圈了,跳出了往年的路数,突出了定性分析与定量分析的关系与重要。也就是说初三复习纯练题是不够的,要重视知识的本质梳理
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最后一题的最后一问的结果与昨天我做的结果是一致的,但是与昨天几个高手做的不太一样,谁对了?
![](https://img.haomeiwen.com/i15338914/7894141814496f93.png)
再思考:应该是高手对了,关键是对题目给出定义的理解,也就是犯了想当然的错误
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正确的图形如下图,A'与A''在OA的中垂线上为所求的情况
![](https://img.haomeiwen.com/i15338914/b501d6a32a1a4b58.png)
若A‘不在OA的垂直平分线上,就会出现如下情况,那么AA''才是那个最小距离,而这个最小距离不是最大,A点可以看做是主动点,B点可以看做是从动点,所以关键在于A点的确定。
![](https://img.haomeiwen.com/i15338914/58725b745d68de72.png)
所以认真审题,按照题目的要求去思考问题很是重要,平时要注意思维定势的去除,学习的态度还是要端正的
![](https://img.haomeiwen.com/i15338914/0f0e49ef51907dc9.png)
此题我的解法与表答是一样的:利用中点构造全等,再利用勾股定理
![](https://img.haomeiwen.com/i15338914/f153a41a444e55f4.jpg)
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