如图,△ABC中,∠C=90°,AC=3x﹣10.
(1)已知AC>2,求x的取值范围;
(2)若AB=x+2,且x为整数,在(1)的条件下,求BC的长.
(1)已知AC>2,求x的取值范围;
(2)若AB=x+2,且x为整数,在(1)的条件下,求BC的长.
![](https://img.xkw.com/dksih/QBM/2020/5/28/2472270734041088/2473766034210816/STEM/2e91fe9506194fd6a1bb8d7be99b44a6.png?resizew=179)
更新时间:2020-05-30 11:12:47
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【推荐1】试写出一个不等式,使它的解集满足下列条件:
(1)它的非负整数解为0,1,2,3,4;
(2)它的整数解为
,
,
,0,1,2,3.
(1)它的非负整数解为0,1,2,3,4;
(2)它的整数解为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
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【推荐1】数学兴趣小组在活动时,老师提出了这样一个问题:如图1,在
中,
,
是
的中点,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法:延长
到
,使
,请补充完整证明“
”的推理过程.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01ccfa50b9cfcffc453c323d028571e.png)
证明:
延长
到点
,使
,
在
和
中,
(已作)
(_________)
(中点定义)
(_________)
(2)探究得出
的取值范围是_________.
【感悟】解题时,条件中若出现“中点”“中线”等字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
【问题解决】
(3)如图2,
中,
是
的中线,
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22c64cfb042014a6b538ab1a0276d14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01ccfa50b9cfcffc453c323d028571e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01ccfa50b9cfcffc453c323d028571e.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503668fcc7878c81c664c13fa47cba29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d063939b34bd543fb3d9e296a43e3e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b7513e09cccf40c3a483064b97e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f6fcb498de407af9576c3aee8f9185.png)
(2)探究得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【感悟】解题时,条件中若出现“中点”“中线”等字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
【问题解决】
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2662d9ebf951d8c3fb819a2eba8bf5fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/ed1a5163-e62d-4e8f-baa5-f3cbcaf6efe3.jpg?resizew=267)
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【推荐2】已知△ABC三边长分别为4,2a+1,7,求a的取值范围.
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【推荐1】已知
,
,
是
的三边长.
(1)若
,
,
满足
,试判断
的形状;
(2)化简:
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](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/47d38149e4a852c9c0a99bed1adbb519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf521f6ac766ef35f593f59ac773af7.png)
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【推荐2】如图,填空:
由三角形两边之和大于第三边,得
___________①___________,
___________②___________
将不等式左边、右边分别相加,得
___________③___________
由图可得:
,∴
___________④___________
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/b3b63853-b310-48c6-a3e0-e5cbd24df948.png?resizew=163)
由三角形两边之和大于第三边,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8a0259b306830a24bb83f5ba42b6cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820852f0c835265b2b6b2ef8e6e1e20f.png)
将不等式左边、右边分别相加,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9e70fbf6a9c5d9275847b78b8a029b.png)
由图可得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8132faa3ab48f02a21d2adf02c22b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133787a9de457e2357a3cec1d66b478b.png)
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解答题-作图题
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【推荐2】如图,已知网格上最小的正方形的边长为
(长度单位),点
在格点上.
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544720911351808/2546282549559296/STEM/120672d41ad54dd19914505172e5718a.png?resizew=244)
(1)直接在平面直角坐标系中作出
关于
轴对称的图形
(点
对应点
,点
对应点
);
(2)求
的面积;
(3)求点
到直线
的距离.
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![](https://img.xkw.com/dksih/QBM/2020/9/7/2544720911351808/2546282549559296/STEM/120672d41ad54dd19914505172e5718a.png?resizew=244)
(1)直接在平面直角坐标系中作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7988923407b9abb78ef8ab45829678fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
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