已为
,
,
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/60ec65e0b27047ea2406cbd43edd049b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda307d24f405db8ac448f23787e1d6f.png)
23-24八年级上·北京海淀·开学考试 查看更多[3]
北京市海淀区师达中学2023-2024学年八年级上学期开学考试数学试题(已下线)第04讲 等腰三角形的判定定理(10类题型)-【帮课堂】2023-2024学年八年级数学上册同步学与练(浙教版)(已下线)期中押题重难点检测卷(基础卷)(考试范围:第1-3章)-【帮课堂】2023-2024学年八年级数学上册同步学与练(浙教版)
更新时间:2023-09-11 10:05:05
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【推荐1】计算:
(1)(+45)+(﹣92)+35+(﹣8);
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(1)(+45)+(﹣92)+35+(﹣8);
(2)
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解答题-计算题
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名校
【推荐1】若三角形
的三条边分别是a,b,c且都为正整数,a、b满足
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解答题-作图题
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【推荐2】在如图所示的正方形网格中,每个小正方形的边长为1,格点三角形(顶点是网格线的交点的三角形)
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(1)请作出
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74236579557f26f1382455d79f949fc6.png)
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(1)请作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】阅读材料:若
,求
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的值.
解:∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676454d1f3fe1077d1f544613af1572a.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55868969a0dc619b0ece1423e2c9f33.png)
∴
,
∴
,
,
∴
,
.
根据你的观察,解答下面的问题:
(1)已知
,求
的值;
(2)已知
、
、
为
三边,且
,判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea4431eb0d74b2ee298f027e71cb967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676454d1f3fe1077d1f544613af1572a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55868969a0dc619b0ece1423e2c9f33.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b075f027a40f9e4f15d481eb20aec4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2e94026e72e6dab46295c229905369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98912998556ef3f2907bee2a7531dc50.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
根据你的观察,解答下面的问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef8e984f930ce80f824533a797bb020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
(2)已知
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8c37b361428021327d8b8c8620546f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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