已知x是无理数,
是有理数,则①
是有理数;②
是无理数;③
是有理数;④
是无理数,这4个结论中正确的有( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eae98b76de205ea7ccb179720518dca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb380288bcecf016773e1ab63aea43dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7b48160e011970bc46093b5b7f1916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad0eb7eae475549dc6adcdce0d381e4.png)
A.0个 | B.1个 | C.2个 | D.3个 |
更新时间:2020-02-26 09:38:53
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【知识点】 整式的混合运算
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适中
(0.65)
【推荐2】在矩形
内,将两张边长分别为
和
的正方形纸片按图1,图2两种方式放置(图1,图2中两张正方形纸片均有部分重叠),矩形中未被这两张正方形纸片覆盖的部分用阴影表示,设图1中阴影部分的面积为
,图2中阴影部分的面积为
.当
时,
的值为( )
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733074619572224/2733439647662080/STEM/e38a6dd8ca2e4b9b92331b6c16a3d7e3.png?resizew=401)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca257288ebd4229902f616f896967c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1598ebcb089e64f6ad1bcde03140a729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ae89bd2dd0a18e1afb5b1a1abd0efd.png)
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733074619572224/2733439647662080/STEM/e38a6dd8ca2e4b9b92331b6c16a3d7e3.png?resizew=401)
A.![]() | B.![]() | C.![]() | D.![]() |
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