已知长为
的铝条,裁下一部分后可以围成一个长方形铝框(部分数据如图所示).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/c0de5c46-54a2-45ad-8e9d-49d9d6526cca.png?resizew=229)
(1)求裁下的铝条的长(用含a、b的式子表示);
(2)若
,
,求裁下的铝条的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345d55deb694622c7514c556a00ea86c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/c0de5c46-54a2-45ad-8e9d-49d9d6526cca.png?resizew=229)
(1)求裁下的铝条的长(用含a、b的式子表示);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
更新时间:2023-10-29 17:06:22
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解答题-问答题
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【推荐1】如图,自行车每节链条的长度为
,交叉重叠部分的圆的直径为
.
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107238418825216/3108866565128192/STEM/32d9d4ca5e614927a753892926b045e4.png?resizew=408)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107238418825216/3108866565128192/STEM/ae4d0c0ee8aa4d24bd953417bd06e169.png?resizew=516)
(1)4节链条拉直后长度为_______
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(2)n节链条拉直后长度为_______
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0794c29dd67ce995cb4ac622fb0555c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a27a670a3cf2ea69157d39c8e9c27d.png)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107238418825216/3108866565128192/STEM/32d9d4ca5e614927a753892926b045e4.png?resizew=408)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107238418825216/3108866565128192/STEM/ae4d0c0ee8aa4d24bd953417bd06e169.png?resizew=516)
(1)4节链条拉直后长度为_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)n节链条拉直后长度为_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(3)如果一辆自行车的链条由50节这样的链条首尾环形相连组成,那么该自行车链条环的长度是_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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解答题-计算题
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【推荐2】郊区某中学学霸父母只要有时间就陪孩子一起完成家庭作业,在某天晚上,勤芬准备完成作业时:化简(
x2+7x+6)﹣(7x+8x2﹣4).发现系数“
”印刷不清楚.
(1)她把“
”猜成3,请你化简:(3x2+7x+6)﹣(7x+8x2﹣4);
(2)爸爸说:“你猜错了,我看了标准答案的结果是常数.”请你通过计算说明来帮助勤芬得到原题中“
”是几.
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397215347113984/2397478728400896/STEM/a9bab5a28e6a4fd493687072575a1066.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397215347113984/2397478728400896/STEM/a9bab5a28e6a4fd493687072575a1066.png?resizew=12)
(1)她把“
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397215347113984/2397478728400896/STEM/a9bab5a28e6a4fd493687072575a1066.png?resizew=12)
(2)爸爸说:“你猜错了,我看了标准答案的结果是常数.”请你通过计算说明来帮助勤芬得到原题中“
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397215347113984/2397478728400896/STEM/a9bab5a28e6a4fd493687072575a1066.png?resizew=12)
您最近一年使用:0次