(1)
的三边长满足等式
,试判断
的形状.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c92201c402f9f9f4e6ac934420170f.png)
(2)若
的三边长为
,
,
,且满足
,试判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2729439b8dc44f1d43a16300cede8cc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c92201c402f9f9f4e6ac934420170f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4afb1b5379ca817a8a95fc36fd79cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
23-24八年级上·全国·课后作业 查看更多[3]
更新时间:2023-05-18 22:20:13
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相似题推荐
解答题-计算题
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【推荐2】计算题和解方程:
(1)计算:
;
(2)分解因式:
;
(3)解分式方程:
.
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ce0a2afe667aa08144f5e713b3d4a0.png)
(2)分解因式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b98d50681878f0843b97c3a3de6c7c.png)
(3)解分式方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddc2ef80761a760f9b7247da44e52d4.png)
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【推荐3】数学家华罗庚说过“数缺形时少直观,形缺数时难入微;数形结合百般好,隔离分家万事休”.请你利用数形结合的思想解决以下数学问题.
(1)根据图中大正方形面积的两种不同表示方法,可得出代数恒等式________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/3d7f77f9-0c16-48c4-9f35-558f3ac438e8.png?resizew=148)
(2)如图,将一张大长方形纸板按图中虚线裁剪成9块,其中有2块是边长为
厘米的大正方形,2块是边长都为
厘米的小正方形,5块是长为
厘米,宽为
厘米的全等的小长方形,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/0c78f9a0-fba7-476e-8c74-19de56ce8365.png?resizew=161)
①观察图形,可以发现代数式
可以因式分解为________;
②若阴影部分的面积为20平方厘米,大长方形纸板的周长为24厘米,求图中空白部分的面积.
(3)若
,请你构造合适的图形,直接写出
的最小值是_________.
(1)根据图中大正方形面积的两种不同表示方法,可得出代数恒等式________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/3d7f77f9-0c16-48c4-9f35-558f3ac438e8.png?resizew=148)
(2)如图,将一张大长方形纸板按图中虚线裁剪成9块,其中有2块是边长为
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/0c78f9a0-fba7-476e-8c74-19de56ce8365.png?resizew=161)
①观察图形,可以发现代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8076ebb445a8d9c63c0eeb33efb44bfc.png)
②若阴影部分的面积为20平方厘米,大长方形纸板的周长为24厘米,求图中空白部分的面积.
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caba9c492ddd20caf815a17fc881c957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c018f4a210bdfb0f5d6559f79256bc91.png)
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解答题-证明题
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【推荐1】人教版教材指出:等边三角形是三边都相等的特殊的等腰三角形.请证明:有一个角是
的等腰三角形是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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【推荐2】已知:如图,
,
为
的中点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/10/17/3348046315085824/3358514651676672/STEM/4d867dbb5a69452881755da9459d9d77.png?resizew=218)
(1)求证:
;
(2)若
,
,判断
的形状,并说明理由;
(3)当
时,若
,取
的中点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2023/10/17/3348046315085824/3358514651676672/STEM/4d867dbb5a69452881755da9459d9d77.png?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0487ebca22d4aa1233073f81fd70a424.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f82351611cf04a8f941b7b0c791496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff7abefc11720d790fc5b4c1f5fa2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a7d8fbc666daa19057d3c46c1a7e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
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【推荐1】如图所示,在每个小正方形的边长均为1的网格中,线段AB的端点A、B均在小正方形的顶点上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/795c8902-3acd-443e-aaa5-416eb61f6ab5.png?resizew=184)
(1)在图中画出等腰△ABC,且△ABC为钝角三角形,点C在小正方形顶点上;
(2)在(1)的条件下确定点C后,再画出矩形BCDE,D,E都在小正方形顶点上,且矩形BCDE的周长为16,直接写出EA的长为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/795c8902-3acd-443e-aaa5-416eb61f6ab5.png?resizew=184)
(1)在图中画出等腰△ABC,且△ABC为钝角三角形,点C在小正方形顶点上;
(2)在(1)的条件下确定点C后,再画出矩形BCDE,D,E都在小正方形顶点上,且矩形BCDE的周长为16,直接写出EA的长为 .
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【推荐2】如图,反比例函数
与一次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
的图象交于点
,点
,一次函数
与
轴相交于点
.
(2)点
是反比例函数图象上
点右侧一点,连接
,以点
为直角顶点作等腰
,若点
恰好也落在这个反比例函数的图象上,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fd5d4de4ec184758751477e29ce734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab957dad7f8446f0df832710f0f176a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d9a25d20b86c2583f6c071091e8e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d572e5292916663894daeb435b5230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ececd20089801c2228b63367418703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c922cbd707131b52757c464804ca24f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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