材料一:对于一个四位正整数,如果满足各数位上的数字互不相同,它的千位数字与个位数字之和等于百位数字与十位数字之和,那么称这个数为“和好数”.若和好数
(
,
,
,
且a、b、c、d均为整数),规定将p的十位数字与百位数字之差的3倍记为
,即
.
材料二:若一个数N等于另一个整数Z的平方,则称这个数N为完全平方数.
(1)请判断3264,5342是否是“和好数”,并说明理由;如果是,请计算
的值;
(2)若正整数s,t都是“和好数”,其中
,
,(
,
,
,
,且m、n、x、y都是整数),当
的值是一个完全平方数时,求满足条件的所有正整数s的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7145e4cfdb57fc2f06856b6aef7c1831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a6fe0a044511f71c14c4a710f358581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ed081826d4582781dab08da4878dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037f8ffecb7de509ad8e637d8077d7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8f779b55ed16b1137891277d94070a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254960851cff96395858b996bd547b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d82ec88890969b6881a85ac1eaf0f8.png)
材料二:若一个数N等于另一个整数Z的平方,则称这个数N为完全平方数.
(1)请判断3264,5342是否是“和好数”,并说明理由;如果是,请计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254960851cff96395858b996bd547b64.png)
(2)若正整数s,t都是“和好数”,其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6728a61a3749ca4115d9985e8ce85a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c8e7576acf18754cba746b658381c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de103b2405a8fd84778220c348f4e157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcd9199d40a04d12c2edf052020636e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65c420d32443f397854a9f59e30e113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812a4090f1e21f56e56055f5048f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b846e36060a872e48fa3bcf8efeca524.png)
21-22八年级下·重庆·期中 查看更多[2]
重庆市重庆实验外国语学校2021-2022学年八年级下学期期中数学试题(已下线)(期中期末真题汇编)第14章 整式的乘法与因式分解 (分层精练)-【题型分类精粹】2023-2024学年八年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)
更新时间:2022-05-05 13:41:48
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名校
【推荐1】在平面直角坐标系
中有两点
,
,若在
轴上有一点
,连接
,
,当
时,则称点
为线段
关于
轴的“半直点”.例:如图,点
,
,则点
就是线段
关于
轴的一个“半直点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7a4d1ecc-b8c9-475c-8617-613ccef3631d.png?resizew=143)
(1)示例中的线段
关于
轴的另一个“半直点”的坐标为________;
(2)若点
为抛物线
上的定线段
关于
轴的“半直点”,求点
的坐标.
(3)在平面直角坐标系中,点
与点
的坐标分别为
,
,点
为线段
关于
轴的“半直点”,对于
轴上任意一点
,都有
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6901e8b018a80e917540462d2f3aadd.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7078a4e8e927c163c7f98e66759c9834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7727391bd56839d2b8d6879b8e6bf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1b6f209d1a805437046ca6ef79dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7a4d1ecc-b8c9-475c-8617-613ccef3631d.png?resizew=143)
(1)示例中的线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a641f364003c2bd1dd6c81bbb03686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在平面直角坐标系中,点
![](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/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9c0002b13f6cae093cd9dc9f19941b.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a8a86950aaab69782ff25b10b3d65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】把一个多项式在一个范围内(如实数范围内分解,即所有项均为实数)化为几个整式的积的形式,这种式子变形叫做这个多项式的因式分解.因式分解是数与式变形的常用技巧.
材料一:由常见因式分解变形结构:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d65122d239d329cc567b5ee8a62b09b.png)
定义新运算
,如![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5fd39e4fdb44b6ecb36ff96ae91244.png)
求证:
,
证明过程:由
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d65122d239d329cc567b5ee8a62b09b.png)
可得:
,
.
则
.
则
.
材料二:若
,可变形为
,即
,
通过该不等式,可把
转换为
,达到降次的效果.
例如:若
均为正整数,且
,求
的最大值和最小值的和.
解答过程:由极端原理:
,
,
最多1个7,其他为4个1,
则
,即:
,所以
.
由均值原理:
,
,
最多1个3,其他为4个2,此时
,
即:
,所以
.
因此:
,(注:
)
请根据材料完成下列问题(3个小问任选2个小问解答,):
(1)定义新运算
,
,若
,计算
的值是多少.
(2)解方程组![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a45e4fc42837d3c0772491e5dd77fe0.png)
(3)
的和为8,其中最大的数不超过最小的数的3倍,求
的最大值.
材料一:由常见因式分解变形结构:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b90faad797ef3c1e8f9bef0bbe99440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d65122d239d329cc567b5ee8a62b09b.png)
定义新运算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c0d2781306051c802c8f90eb0475db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5fd39e4fdb44b6ecb36ff96ae91244.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dd6bf353f1469bd4fec70a1e7fa8f9.png)
证明过程:由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b90faad797ef3c1e8f9bef0bbe99440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d65122d239d329cc567b5ee8a62b09b.png)
可得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f368669db241086466237291ea3fd0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc501065199e950b0240095aaf33f3f.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87791f655a001a4b071ae10f6d39f7a.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d042fdf01689094134cb69c6b2e8b990.png)
材料二:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86248f38f24b63ac238d29b0989d4353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ced4f1fe334f987b78faff74ab9539a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a85eb7e8e5e49aeef3542b89680986f.png)
通过该不等式,可把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a212f9484081a03b682e1baf1ac24ac.png)
例如:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcefebc3b2367025e671d60e57316703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30245d295edd5dfe01431761eb4f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0504b895b23339db4ef8f706d88d20.png)
解答过程:由极端原理:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30245d295edd5dfe01431761eb4f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcefebc3b2367025e671d60e57316703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae85054fd4769a7ef719c1780748c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e946b58322a4bf67d8acfb62ef5ca8f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d0c48aca310033aff4c29dfeb46a5c.png)
由均值原理:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30245d295edd5dfe01431761eb4f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcefebc3b2367025e671d60e57316703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb123dc11b0558913da1f60739935c27.png)
即:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b7372f9b76ea3e7a6876e4b8352a43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79918e15aba26b34d7e89baa800658e6.png)
因此:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8aab1bd458395c7647927ea5c6f5564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0110b6326b8ceec6783cc82702bd4daf.png)
请根据材料完成下列问题(3个小问任选2个小问解答,):
(1)定义新运算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c0d2781306051c802c8f90eb0475db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0526237936c69cb41f7fd1eaedebb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27169dc44896dfdb98d9fc46f9815a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3292a7444b7e76515cee05ffe1eea50.png)
(2)解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a45e4fc42837d3c0772491e5dd77fe0.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426d5cc6b7b42522ca0e09ad30fee401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deea6e0f208aa36bb5b31a1d509f1fa0.png)
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【推荐1】我们定义:一个整数能表示成
(a、b是整数)的形式,则称这个数为“完美数”.
例如,5是“完美数”.理由:因为
,所以5是“完美数”.
[解决问题]
(1)已知29是“完美数”,请将它写成
(a、b是整数)的形式______;
(2)若
可配方成
(m、n为常数),则
______;
[探究问题]
(3)已知
,则
______;
(4)已知
(x、y是整数,k是常数),要使S为“完美数”,试求出符合条件的一个k值,并说明理由.
[拓展结论]
(5)已知实数x、y满足
,求
的最值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
例如,5是“完美数”.理由:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0f7368432b977563895c2d28862766.png)
[解决问题]
(1)已知29是“完美数”,请将它写成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178d0ab9417a5f9ad9d2cd324612d642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855c1b3733e046c292c4e166954ef216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f99e6e10e61af2e7734c4d01ea90c.png)
[探究问题]
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af860678725c6ea1c72d33416d436fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bec55c3826d2d5adee734c2ce790c.png)
[拓展结论]
(5)已知实数x、y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db84f9e2c9f7393430ad6c5962c7ab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e3da18d31497e7c2ce5217d139f80e.png)
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【推荐2】(25分)在
中,有多少个不同的整数(其中,[x]表示不大于x的最大整数)?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac9b0910059b1862c18676c0e0888c4.png)
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