用代数式表示“x与y的3倍的差”是( )
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更新时间:2024-01-26 21:29:52
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【推荐1】图1的直角柱由
个正三角形底面和
个矩形侧面组成,其中正三角形面积为
,矩形面积为
.若将
个图1的直角柱紧密堆叠成图
的直角柱,则图2中直角柱的表面积为何?( )
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316741015068672/2316773688262656/STEM/c1a7206b92d04bb3ac8c4a685ca743b5.png?resizew=235)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316741015068672/2316773688262656/STEM/c1a7206b92d04bb3ac8c4a685ca743b5.png?resizew=235)
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【推荐2】现有
长的木料,要做成一个如图所示的窗框,若窗框的宽为
(木料厚度不计),则窗框的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/b65bf0ba-9bc1-4d56-8228-e06914fecc56.png?resizew=94)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751f74aa8918bb849dca5f2d52e067c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/b65bf0ba-9bc1-4d56-8228-e06914fecc56.png?resizew=94)
A.![]() | B.![]() |
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