我们在学习“实数”时,画了这样一个图,即“以数轴上的单位长为

我们在学习“实数”时,画了这样一个图,即“以数轴上的单位长为‘1’的线段作一个正方形,然后以原点O为圆心,正方形的对角线OB长为半径画弧交x 轴于点“A”,请根据图形回答下列问题

1.线段OA的长度是___________

2.这种研究和解决问题的方式,体现

          的数学思想方法。(2分)(将下列符合的选项序号填在横线上)

A. 数形结合   B. 归纳    C. 换元   D. 消元

 

答案

 

1.

2.A

 解析:略

 

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