生活中,我们常用到长方形样、不同型号的打印纸.基于满足影印(放大或缩小后,需保持形状不变)及制作各型号纸张时,既方便又省料等方面的需要,对于纸张规格,存有一些通用的国际标准其中,把A
0纸定义为面积为1平方米,长与宽的比为
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
:1的纸张;沿AO纸两条长边中点的连线裁切,就得到两张A
1纸:再沿A
1纸两条长边中点的连线裁切得A
2纸……依此类推,得A
3 , A
4 , A
5等等的纸张(如图1所示).若设A
4纸张的宽为x米,则x应为( )
![](http://tikupic.21cnjy.com/2023/06/27/fe/6f/fe6f258e8d0d02c1c7c72fd45fc3e4a2_m_158x210.png)
- A、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E16%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
- B、
的算术平方根 - C、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E32%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
- D、
的算术平方根