下列说法正确的是( )
A.平方根和立方根都等于本身的数是0和1 |
B.一个直角三角形的两边分别为3和4,则第三边为5 |
C.-2是4的平方根 |
D.两个无理数的和一定是无理数 |
更新时间:2020-11-08 06:41:35
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【推荐1】下列说法:
①不相交的两条直线叫做平行线;
②若
与
是内错角,且
,则
;
③垂直于同一条直线的两条直线互相平行:
④在同一平面内,如果
,
,那么
;
⑤直线外一点到这条直线的垂线段,叫做这个点到这条直线的距离;
⑥过一点有且只有一条直线与已知直线平行;
⑦在同一平面内,如果a与b相交,b与c相交,那么a与c一定相交;
⑧若两条平行线被第三条直线所截,则一组同旁内角的角平分线互相垂直;
⑨若两个角的两边分别平行,则这两个角相等;
⑩m是一个实数,则
没有平方根.
其中真命题有( )
①不相交的两条直线叫做平行线;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
③垂直于同一条直线的两条直线互相平行:
④在同一平面内,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048e833e0c0995d4cf039ed30ba38b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbe893317151c782ec2338e372cb424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1491c75d35618aca149e838816d8490e.png)
⑤直线外一点到这条直线的垂线段,叫做这个点到这条直线的距离;
⑥过一点有且只有一条直线与已知直线平行;
⑦在同一平面内,如果a与b相交,b与c相交,那么a与c一定相交;
⑧若两条平行线被第三条直线所截,则一组同旁内角的角平分线互相垂直;
⑨若两个角的两边分别平行,则这两个角相等;
⑩m是一个实数,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93129dde5fa5cd84e3702e457535e274.png)
其中真命题有( )
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】已知实数a的一个平方根是
,则此实数的算术平方根是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
A.![]() | B.![]() | C.2 | D.4 |
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【推荐1】下列说法
是8的立方根;
是64的立方根;
是
的立方根;
的立方根是
,其中正确的说法有( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41af0d4fad9a3119a87faa2972d17133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9301d494b24df4f90f37c43737ed9d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d63e8105ccdc6db6e7f757c2170065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea98e740c8b7ecf8544dae2cebf25af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3011e0fc8b1616f1f7bc0b495973097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395addb4439331615a7f220289d8b62c.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】下列说法中,正确的是 ( )
A.1的任何次方根都是1; | B.0的任何次方都是0; | C.负数没有方根; | D.正数的平方根互为相反数 |
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【推荐1】如图,
中,
,
,分别以顶点
,
为圆心,大于
的长为半径作弧,两弧在直线
两侧分别交于
,
两点,过
,
作直线与
交于点
,交
于点
,连接
.若①
;②
;③
;④直线
是线段
的垂直平分线;⑤若
,则
的周长为
.则上述结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2b7f5cd646fe9dd4bb1e1330769299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692be2bd41b2fecc7c60723d1bda976f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8ce3af4777d0267b103c1efe8513c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513f969c09271b64a566af261603361e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/b93ed3de-617f-44ca-8c7a-7d4f3bcc7c03.png?resizew=148)
A.5个 | B.4个 | C.3个 | D.2个 |
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【推荐2】如图,点
是正方形
中
边上一点,
于点
,BF//DE,且交
于点
,若
,
,则
的长是( )
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024375242178560/3030060528386048/STEM/dd2219e5bccc4a39a969bddcfa4008bc.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd99874843902d155f3f9dc26b924f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024375242178560/3030060528386048/STEM/dd2219e5bccc4a39a969bddcfa4008bc.png?resizew=145)
A.![]() | B.![]() | C.![]() | D.![]() |
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