2024六年级下·上海·专题练习
1 . 如图,使用圆规和直尺分别画出
和
的角平分线
和
,如果
,那么:
、
;
(2)写出
的度数___________.
(3)反向延长
到
,写出与
互补的角:___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b78308c08f97a465ad608e284ed4afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(3)反向延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955c43457ada30fd2b01d2c058a43d7a.png)
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2 . 【图形感知】
如图1,
,点
在直线
上,点
在直线
上,点
为
、
之间一点.
,它可以通过如下方法证明,请你帮忙完成该结论的推理过程.
证明:如图①,过点
作
,
∵
,
(已知),
∴
_________(平行于同一条直线的两条直线平行),
∴
,
,
∴
(等式性质)
∴
.
(2)如图3,该基本图形称为“
型”(实线部分),仿照上面结论的推理思路可得
、
、
之间的关系是________;
(3)如图4,直线
,点
,
在直线
上,点
,
在直线
上,直线
,
分别平分
,
,且交于点
.猜想并证明
与
的数量关系.
(4)如图5,已知
,
与
两个角的角平分线相交于点
.
若
,
,设
,
________
.(用含有
,
的代数式表示)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198718d123eb1f8f988d2e04b01dfe55.png)
证明:如图①,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00604947c63f9a8820c17ed3119827d5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00604947c63f9a8820c17ed3119827d5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1a378a3a4660eb1ece52085a9b44d5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de96d1491567868c54a5fd276489deed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08294498984a4056300001478610df24.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8725ac7692814a340c81577f19777b76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198718d123eb1f8f988d2e04b01dfe55.png)
(2)如图3,该基本图形称为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431bd1ab475f5c7936a3b45b317abe99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(3)如图4,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(4)如图5,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefb9a7a779b6c8d21187ee751c420a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9444b698d7c072a1bc3d46485cb2f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c86fc02d6dd49a04ad18240e24e91d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f982ff032e9e6a117987301c1ed1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e71b29260539127707d057749325e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd00540dba9c02cf78f01abd08db7cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3 . 如图,已知
,P为
下方一点,G,H分别为
上的点,
,
,(
,且
,
均为锐角),
与
的角平分线交于点F,
平分
,交直线
于点E,下列结论:①
;②
;③若
,则
.其中正确的序号是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2a151188cf03561bab270af77d9367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799532b1fab265c5b854ad03928c7022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229b8447cb77e1e7b23f744a3246aefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9247c382e25f3c346c90e72089b7202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf32f2a1617f99e333e26ab909b8222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610ff1de36cacd216427654a002f00c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c538a7eba429468aeaaf59e4ed1f57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28a9220c69af42b1bd27ee9e5dd48e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4ea9ffbbabd6b5c90e4678c15bb1e1.png)
A.①② | B.②③ | C.①③ | D.①②③ |
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4 . 如图,直线
与
相交于点
,
为直线
上一点(不与点
重合).
(1)用直尺和圆规过点
作直线
,使
成为
的同位角(不写作法,保留作图痕迹);
(2)当
时,
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/9e6d3bf3-382c-489e-8b80-2750b6ee9d57.png?resizew=170)
(1)用直尺和圆规过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117878cbd8c00f2aabcdf62b487e2dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bac5b9c067002bc06fb400d6c4f3512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a02c61cb552d1173b18b42f8d160dd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3885f598fc3d5edda9f7fddcd879e6fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8df55432cf7b5b309429aee39ba196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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2023-06-27更新
|
214次组卷
|
2卷引用:安徽省合肥市瑶海区2022-2023学年七年级下学期期末数学试题
5 . 如图,直线
分别与直线
、
相交于
、
两点.
(1)当
时,要使得
,则
应为______
;
(2)若
,
平分
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8c27d40316f5d253cac6514f17b764.png)
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/f7655459-954b-4fbb-abcd-400b41923ab0.png?resizew=146)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6ba026cce6098953712d9492610a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dead4ac2888f0b21175f8a72b4924f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8c27d40316f5d253cac6514f17b764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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2023-06-27更新
|
227次组卷
|
2卷引用:安徽省合肥市瑶海区2022-2023学年七年级下学期期末数学试题
6 . 下列命题是真命题的是( )
A.若两个角不是对顶角,则这两个角不相等 | B.若![]() ![]() |
C.一个角的补角大于这个角 | D.点![]() ![]() |
您最近一年使用:0次
7 . 如图1,直线
与
相交于点O,
,
平分
,
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/3e53e984-a6c5-4597-b592-b5361ce88e19.png?resizew=252)
(1)图中与
互补的角是___________;
(2)求
的度数;
(3)如图2,若射线
从射线
的位置出发,绕点O以每秒
的速度逆时针旋转一周,当旋转时间为t秒时,
三条射线中恰好有一条射线是另外两条射线所组成的角的平分线,请你直接写出旋转时间t的值.(旋转过程中
,
,
都只考虑小于
的角)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f673fa31e07dfd3c4400fbfd3faee06f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd836106fad0cb7cb46ee0d345ec559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/3e53e984-a6c5-4597-b592-b5361ce88e19.png?resizew=252)
(1)图中与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb60036876b3c5aa09bb9570e57328b.png)
(3)如图2,若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acaf82e360a740a5777b43d5bec39bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955c43457ada30fd2b01d2c058a43d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5329fae2948af2f9772dd3a64d850979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb60036876b3c5aa09bb9570e57328b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
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2023-02-28更新
|
390次组卷
|
6卷引用:湖北省荆州市公安县2022-2023学年七年级上学期期末质量监测数学试题
湖北省荆州市公安县2022-2023学年七年级上学期期末质量监测数学试题(已下线)期中模拟预测卷02(测试范围:第五、六、七章)-2022-2023学年七年级数学下学期期中期末考点大串讲(人教版)湘教版七年级上册第四章图形的认识单元测试数学试题湖北省荆州市公安县2022-2023学年七年级上学期七年级期末数学试题福建省 泉州师院附中、玉埕中学12月联考2023-2024学年七年级上学期月考数学试题湖北省孝感市孝南区2023-2024学年七年级上学期期末数学试题
8 . 如图,三角尺
的直角顶点P在直线
上,点A,B在直线
的同侧.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/a6feb784-db1a-400f-bdb2-35e5313eb7b8.png?resizew=399)
(1)如图①,若
,求
的度数.
(2)如图②,若
平分
,
平分
,求
的度数.
(3)绕点P旋转三角尺
,使点A,B在直线
的异侧,如图③,当
时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/a6feb784-db1a-400f-bdb2-35e5313eb7b8.png?resizew=399)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1259a08a666205cd08c53eb8d76287dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
(3)绕点P旋转三角尺
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581e74998dd2473f7aab03932d27f8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
您最近一年使用:0次
2023-02-24更新
|
352次组卷
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5卷引用:浙江省杭州市八区市2022-2023学年七年级上学期期末学业水平测试数学试题
浙江省杭州市八区市2022-2023学年七年级上学期期末学业水平测试数学试题(已下线)七年级数学期末模拟卷01(浙江专用)(浙教版七上全册)-学易金卷:2023-2024学年初中上学期期末模拟考试(已下线)专题07 角度旋转四大类压轴问题复习-【好题汇编】备战2023-2024学年七年级数学上学期期末真题分类汇编(浙教版)(已下线)专题09 七年级上册浙江省期末试卷简答题压轴题分类训练-【好题汇编】备战2023-2024学年七年级数学上学期期末真题分类汇编(浙教版)山东省德州市乐陵市2023-2024学年七年级上学期期末考试数学试题
21-22八年级下·全国·课后作业
9 . 一个五角星图案如图.已知五边形
的各个内角都相等,分别求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09a901ad5cc2a28df647c228816a142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7ead0e650ff47273eaa046ebe80b97.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/5250b341-4841-47b9-b3d6-daa596b18517.png?resizew=197)
您最近一年使用:0次
10 . 如图是嘉淇的答卷,他答对的题数是( )
姓名:嘉淇 判断题. ①绝对值等于它本身的数是正数.(√) ②2的倒数是 ![]() ③将8.20382精确到0.01为8.21.(×) ④ ![]() ⑤40°的补角是50°.(√) |
A.2个 | B.3个 | C.4个 | D.5个 |
您最近一年使用:0次
2022-08-04更新
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133次组卷
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3卷引用:河北省沧州市孟村县2021-2022学年七年级上学期期末考试数学试题