1 . 已知点P的坐标为
,且
和
是一个正数的两个平方根,求点P关于原点的对称点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d76a9f2d3248f040bfbdc71db6f935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13f85438d736028efaebf05a4c42e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06525afacdee1259675b926b6001d2ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
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2024-05-06更新
|
25次组卷
|
2卷引用:河南省焦作市2023-2024学年七年级下学期期中数学试题
2024七年级下·江苏·专题练习
2 . 定义:如果一元一次方程的解也是一元一次不等式组的解,那么称该一元一次方程为该不等式组的“相伴方程”.例如:方程
的解为
,不等式组
的解集为
,因为
,所以称方程
是不等式组
的相伴方程.
(1)问方程
是不是不等式组
的相伴方程?请说明理由;
(2)若关于x的方程
是不等式组
的相伴方程,求a的取值范围;
(3)若方程
和
都是关于x的不等式组![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c18210b2ae7940638111ef1612d66.png)
的相伴方程,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90986a5730841b58f03a0ce30f6a49bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43b6ed6dc97d2b7b782e3e04081e362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef8634d2d5a531ebffd843f50644b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec1fd4c9e140e4fa7375cc12d515b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90986a5730841b58f03a0ce30f6a49bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43b6ed6dc97d2b7b782e3e04081e362.png)
(1)问方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69868ff8dd07b743d7a937e0af26d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2feda1233d24833dce92363cedd1bbe7.png)
(2)若关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a441ef181b533e6322b05b6cb1920beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd7dddca4eca99ce8a7296542589dfb.png)
(3)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf78931480d1b69363ace581300e88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4361b9924ed580e7bbf5e6e00dc839fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c18210b2ae7940638111ef1612d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e71af710b0fe205d63cc7ea1420ab6.png)
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3 . 如图,数轴上两点A、B对应的数分别是
,点
是线段
上一动点,给出如下定义:如果在数轴上存在动点
,满足
,那么我们把这样的点
表示的数称为连动数,特别地,当点
表示的数是整数时我们称为连动整数.
是连动数的是______;
(2)关于
的方程
的解满足是连动数,求
的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02d9f149c12ef612345a0617650215e.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d10c567c0419ae04df94f2ccf48992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0080d449296277297ce169a1522a190c.png)
(2)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652c95d1bc701acd4f9ed5ea6362f399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
4 . 阅读理解:如果一元一次方程的解是一元一次不等式组的一个解,则称一元一次方程为该不等式组的一个关联方程,如一元一次方程
的解是
,一元一次不等式组
的解集是
,因为
,所以一元一次方程
是一元一次不等式组
的一个关联方程.
(1)试说明方程
是不等式组
的一个关联方程;
(2)若关于x的方程
的解是整数,且它是不等式组
的一个关联方程,请求出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776b26892877019247c7a50f735b0f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be736ec684b0002cee17d28765b10c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35655254f5b7b6f3d0ec32b4d8729c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5273e70f4fdcce466b6956cffb04807e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776b26892877019247c7a50f735b0f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be736ec684b0002cee17d28765b10c2.png)
(1)试说明方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98387b3821a8fddbd24258dd0f00e707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed7a391d53e0ada7fe955123d34976fe.png)
(2)若关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d43ff600828209fd8b6c5afaef57fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee9fca365c14f24b321effc1c1a346.png)
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5 . 已知关于
的方程
是一元一次方程.
(1)求
的值;
(2)若已知方程与方程
的解相同,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0155de4e1cbe2066810cbd667fb58e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若已知方程与方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda5921933e7f748d4cfc7fe7dc4b83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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6 . 已知当
,
都是实数,且满足
时,称
为“开心点”.例如点
为“开心点”.
因为当
时,
,
,得
,
,
所以
,
,
所以
,
所以
是“开心点”.
(1)点
,
,
中,“开心点”是________;
(2)若点
是“开心点”,请判断点
在第几象限?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16f11f31e24f5b6338810fc3972db18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f182520b2c3fecb40bedbf4f38117961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643b31966f52a03f001f2e613cd701dc.png)
因为当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643b31966f52a03f001f2e613cd701dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29a96bae1cc10c2c3cf4d219ec9f1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9113d3d6c28e03b7aeaca4e3a159e385.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd09fb9482124fd35f19b86894648f4.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2539463b3ec5309d87fe5ee657eb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505ef6d853c8ba8cb65fecc27daf9638.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16f11f31e24f5b6338810fc3972db18.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643b31966f52a03f001f2e613cd701dc.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10eba0e8e9ae3fb3967be44322c66d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba8ce03ab17aef341e4fc3e621c58f4.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cee2c7c89549d5e103f03d68d5fa976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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7 . 已知关于
的一个方程
是一元一次方程.
(1)求m的值.
(2)若此方程的解与关于
的一元一次方程
的解互为相反数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee464f0f54f1c7de20cc4e2e0e67f8ec.png)
(1)求m的值.
(2)若此方程的解与关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfdf1497a5b1d959fe232acc48240269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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8 . 计算:
(1)已知
,求
的值.
(2)已知
,求
的值.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52cca063a71e8c9610b371cb144030dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2905535cca7f7e93d34f2040d61961a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe4df2f2d61a1a0f7e53e797df31bfb.png)
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9 . 对x,y定义一种新的运算T,规定:
,其中
.例如:
,
.
(1)计算:
______(用含a的代数式表示);
(2)若
,关于x的不等式组
恰有4个整数解,求m的取值范围;
(3)若
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966249ce12ab564d1ad975f1dab29bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842ca2dd6d5a5462f4d49d6d702d69d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f813ca2e826ba52249879dc12d9b9a.png)
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd68d31a7b102444dca5df2cc6b6f89.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6519bece7cc3f913b592a7f5dd303b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968396946fe1c090b39def5aabcafa79.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d34bc57ac0b9328f5c2c7a824a6f6f.png)
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10 . 规定:若整式A与
满足
(
为整数)则称A与
为关于
的和谐整式.例如,若
,我们称
与
为关于3的和谐整式 .
(1)若
与
为关于1的和谐整式,
的值____ ;
(2)若
与
为关于5的和谐整式,
与
为关于5的和谐整式,
的值____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892a967545fbfacd2efd0c7798d439ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598968a6946230ab37047414a3507863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1d2e5599453f8d4c04369bc8f79962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6789eb3061247eced0ec7806c9969629.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272f801e4afe574af5706f49868941d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1e8ee7729cddafddcfffd084bc71c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1d2e5599453f8d4c04369bc8f79962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43557b716fa38a8aeca410d7c8ba1909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e1725516933bb441200c903bfa1ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f65baa5af2b0201a9d1d59c20a03c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
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