1 . 如图①,在平面直角坐标系中,点
,
,其中,
是16的算术平方根,
,线段
由线段
平移所得,并且点
与点A对应,点
与点
对应.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718803806363648/2791714323496960/STEM/2b11ddea-a658-4f60-b6a8-36cb451a4a74.png)
(1)点A的坐标为 ;点
的坐标为 ;点
的坐标为 ;
(2)如图②,
是线段
上不同于
的任意一点,求证:
;
(3)如图③,若点
满足
,点
是线段OA上一动点(与点
、A不重合),连
交
于点
,在点
运动的过程中,
是否总成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8da179d60dd9ec6ece6de442ae1b06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ae87c9559e59b7fcba8cf85ebb6427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8778efda439b42d618e8706c6c7677b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59faf75f0c95312e556ae905b3ff5b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718803806363648/2791714323496960/STEM/2b11ddea-a658-4f60-b6a8-36cb451a4a74.png)
(1)点A的坐标为 ;点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18918b8aac97298d00a53775546cee5.png)
(3)如图③,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6825c543fedee205e5f4f259fd7ec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a37f3ecab5ac55a9076643fa4abf68a.png)
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2 . 若
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708e3d846df5f9cec899927e7db1fdbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知19683的立方根是一个整数,请求出这个整数.
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4 . 【发现】
①
;
②
;
③
;
④
;
;
根据上述等式反映的规律,请再写出一个等式:________.
【归纳】
等式①,②,③,④,
所反映的规律,可归纳为一个真命题:对于任意两个有理数
,
,若
,则
;
【应用】
根据上述所归纳的真命题,解决下列问题:若
与
的值互为相反数,求
的值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882f9eb8f6a0546e669297b7af725c92.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ba992cb7aeb8d1fea1a06cbf33ff09.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd9bf38ba7aab964aa5c73fdd5b0b54.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805d2410debc99144d161c3827548d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee7bb49247387a9028602315729f8d7.png)
根据上述等式反映的规律,请再写出一个等式:________.
【归纳】
等式①,②,③,④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.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/fbd65171f7c62ffc38d1e0b77613a069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9cdea1e995c59e5d3225acad8b4d3c.png)
【应用】
根据上述所归纳的真命题,解决下列问题:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a177fe47b42e26dc773d8972f6af8a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8dcac8879589fb924945b4eb9ed2af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f04a6ba38332111f8e65cc1a345821.png)
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2021-08-12更新
|
157次组卷
|
2卷引用:重庆市“梯城教育联盟”2020-2021学年七年级下学期期中测试数学试题
5 . 你知道怎样迅速准确地计算出195112的立方根是多少吗?请按照下面的问题试一试:
(1)由
,
,推出
是______位数;
(2)由195112的个位数是2,推出
的个位数是______;
(3)如果划去195112后面的三位112,得到195,而
,
,推出
的十位数是______,所以,
______.
(1)由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abad0be7978c58988e9c1fcc9da7c26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a15ff967c8875b69e86e44092ea58af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4303d01bf3b2b0655d9fda821c06a922.png)
(2)由195112的个位数是2,推出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4303d01bf3b2b0655d9fda821c06a922.png)
(3)如果划去195112后面的三位112,得到195,而
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00fc6f3e34bed4c0b625f72424bdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd555d19b2658a6691165f9865ff421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4303d01bf3b2b0655d9fda821c06a922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa32b6f8c2a04b1428ee366df6f126b7.png)
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2021八年级上·全国·专题练习
6 . 指出下列各数中的有理数和无理数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938cbf7d9509b8abd984791076d480a6.png)
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7 . 下面为一凡同学的小测卷,他的得分应是___ 分
姓名一凡得分______
判断对错(每小题20分,共100分)
(1)5是25的算术平方根(√);
(2)
是
的平方根(×);
(3)(﹣4)2的平方根是﹣4(×);
(4)±4是64的立方根(×);
(5)(﹣4)3的立方根是﹣4(√).
姓名一凡得分______
判断对错(每小题20分,共100分)
(1)5是25的算术平方根(√);
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55680ba5f18c5c3a32b3d6738abb1c35.png)
(3)(﹣4)2的平方根是﹣4(×);
(4)±4是64的立方根(×);
(5)(﹣4)3的立方根是﹣4(√).
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8 . 计算:
(1)(1)
(2)计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b30ac0064b35863e7d4ec3d84b2fcb.png)
(3)解方程组
.
(4)解方程组
(5)解不等式组
(1)(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77a696545aa175c59066f913148b8c9.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b30ac0064b35863e7d4ec3d84b2fcb.png)
(3)解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9183333910066434f2092ba5e40d34f7.png)
(4)解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab063f2194499b3694163c17237ba339.png)
(5)解不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17212d3ec4e99e9a1d287ffa8bf18e8b.png)
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9 . 若8的立方根是a,b的算术平方根是3,m的两个平方根分别是5和n.
(1)求
的平方根;
(2)求
的立方根.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120603024f3ce35f35dc7c6bc3325e5e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c142b88821e2e5c28e8493267b51674d.png)
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10 . 下列命题,是真命题的是( )
A.直角三角形的一个内角为32°,则另外一个锐角为68° |
B.如果![]() ![]() |
C.有两边和一角对应相等的两个三角形全等 |
D.如果一个数的立方根等于这个数本身,那么这个数是0或![]() |
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2021-07-26更新
|
156次组卷
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2卷引用:湖南省邵阳市新邵县2020-2021学年八年级上学期期末数学试题