已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8a31dd31148e6e0cb0956217b42547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
2021七年级下·全国·专题练习 查看更多[2]
(已下线)第十二章 实数【专项训练】-2020-2021学年七年级数学下学期期末专项复习 (沪教版)(已下线)专题04 无理数与实数-2021-2022学年八年级数学上册链接教材精准变式练(北师大版)
更新时间:2021-06-12 15:22:56
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适中
(0.65)
名校
【推荐1】(1)已知数
,
,
满足
,求
的值.
(2)已知
是
的整数部分,
是
的小数部分,
,求
的值.
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7d20dc31f0dc9c950a402f00109635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ac5ec5412ca9816721d60dc281f63e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc37d32e463147df9733d0be2c2d8e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833b52602406f7888a46ba52978dc8f1.png)
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适中
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【推荐2】在平面直角坐标系中,点
,
,若a,b满足
.
(1)求点A,B的坐标;
(2)如图1,连接
,求
的面积;
(3)如图2,3将线段
平移到
.
①若点E在y轴上,点F在x轴上,点
在线段
上,试确定m,n应满足什么关系式?
②若点E在x轴上,点F在y轴上,点D在直线
上,且点D的纵坐标为t,当满足
时,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82388095a4e6d9decccae2b24fe28138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706b46d9b49e40bceb0fba9c7734f69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd5f215a38e6d6d08125ef93ffec3cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/525222a0-1160-4450-9886-7eb532eb9fbb.png?resizew=531)
(1)求点A,B的坐标;
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d071d008cdc313f6ed16a602f8a9669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(3)如图2,3将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
①若点E在y轴上,点F在x轴上,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5356182cc3bc478f7c2e3e6dee25e58d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②若点E在x轴上,点F在y轴上,点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c612d390b869542b6240a1f85cf7fce1.png)
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解答题-计算题
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【推荐1】化简
,并求值.其中a与2、3构成
的三边,且a为整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bac4b6970dd6f3e274a41d6f8b36c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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适中
(0.65)
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【推荐2】先化简
,再从1,0,
中选一个使原式有意义的数代入并求值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accbcded03455cd2109e1b8e090270cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74eb8a7738402df52d4a97262b85ca0.png)
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