阅读材料:
对非负实数
四舍五入到个位的值记作
,即:当
为非负整数时,
如果
,则
.
如:
,
,
,
,…
试解决下面问题:
(1)
___________;
(2)判断下列命题是真命题还是假命题,是真命题的画“√”,是假命题的画“×”.
①对于非负实数x、y,
.( )
②当
,m为非负整数时,
.( )
(3)若
,求实数x的取值范围.
对非负实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c2719fc8914037d61e5bac0e1c5980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692f19277572dc695f32be2f6b683c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a455864f54df9766d29831cdcc866b3d.png)
如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea019e5fa891edbb6ff155477b1f94d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef793cd5de0f1ba40dc23b577e9645c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb6bf22f195de77d1f53bea4d502e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a963ad890e93051a7699387465405f.png)
试解决下面问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb99b80b50afc979daf93eb441e3b0c.png)
(2)判断下列命题是真命题还是假命题,是真命题的画“√”,是假命题的画“×”.
①对于非负实数x、y,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c1e9217a7193f576178f6b8eff6a47.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38883fa2bef475a4df99f89942c3767f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89935d3e62ecc4535883581fa5eb7248.png)
更新时间:2023-06-26 11:53:50
|
相似题推荐
解答题-计算题
|
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【推荐1】在学习《实数》内容时,我们通过“逐步逼近”的方法可以计算出
的近似值,得出
.利用“逐步逼近”法,请回答问题:
(1)
介于连续的两个整数
和
,且
,那么
,
;
(2)如果
的小数部分为
,
的整数部分为
,求
的值;
(3)已知:
,其中
是整数,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a9f422b65d0621a15cf25564581e23.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.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/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bff55620f324055808c554b4a705a2b.png)
(3)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e2fe9e6c786e5c34cb54e8bb0a95bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b76bcd3900721a34005977674d76c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3677f2a2a1b4aef3a370a03db832366.png)
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【推荐2】已知某正数的两个不同的平方根是
和
;
的立方根为
;
是
的整数部分.
(1)求
的值;
(2)求
的平方根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd17fe6d760c573bf6341c9f2f7fde4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7570c77bd375f4dfdffee64fce8d1a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686448163a2f7029918d12f82d128743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae24688d4c45aad43e9af0b7bbfda6b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3be1fa86f99e29a08ba7d3c2b341fb9.png)
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【推荐1】阅读下列材料,然后回答问题:
若一个正整数,从左到右各数位上的数字与从右到左各数位上的数字对应相同,则称为“回文数”(例如:1、77、323、5665等都是回文数).
对于一个三位回文数
,将它各个数位上的数字分别两倍后取个位数字,得到三个新的数字
,
,
,我们对A规定一个运算:
,例如:
是一个三位的“回文数”,其各个数位上的数字分别2倍后取个位数字依次是:0、6、0,则
;又如:
.
(1)记最大的两位“回文数”为
,最小的四位“回文数”为
.
①直接写出
的值:
______;
______;
②分别计算
、
的值;
(2)一个三位的“回文数”
,将其各个数位的数字分别2倍后取个位数字依次为:
,
,
,若
,求出
的所有值.
若一个正整数,从左到右各数位上的数字与从右到左各数位上的数字对应相同,则称为“回文数”(例如:1、77、323、5665等都是回文数).
对于一个三位回文数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f63e74ab98ef9d0938199ed6cd889d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abae3d8156494e97363d038dcddfee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de062982011f1a0dc40d07ad476533a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5ecb621a65a6e67ea50f75e0b38bf7.png)
(1)记最大的两位“回文数”为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55c23f1782d16f190469765e02b8c33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8b8f0c729dba1697e8b53fcf5669b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841bab4c8c9ca6bfbc3e0005cac1a1a3.png)
②分别计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616becd5913aa5a0532a3a67ac04f371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82667f46a9725f23856b2992f8a944c4.png)
(2)一个三位的“回文数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7a7052695188a9e6efc15a22aeb906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
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【推荐2】在形如
的式子中,我们已经研究过已知
和
,求
,这种运算就是乘方运算.现在我们研究另一种情况:已知
和
,求
,我们把这种运算叫做对数运算.
定义:如果
(
,
,
),则
叫做以
为底
的对数,记作
.
例如:因为
,所以
;因为
,所以
.
(1)根据定义计算:
①
______;②
______;③
______;④如果
,那么
______.
(2)设
,
,则
,
(
,
,
均为正数),因为
,所以
所以
,即
.这是对数运算的重要性质之一,进一步,我们还可以得出:
______.(其中
均为正数,
,
)
______(
,
,
均为正数).
(3)结合上面的知识你能求出
的值吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5c5cca2a9b7ad2bc0dfcb061b0b338.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
定义:如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5c5cca2a9b7ad2bc0dfcb061b0b338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a891d21bb2c7a11304beaab5054074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77ab402e9ad912968d9e1356428f661.png)
例如:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feae878a430a1b23774127547d842cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543fa7a3983d368c56acf31b2d454849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476e770caa157f9056527c9e34a544c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a90ae8051097f6f08ae754aac144c1.png)
(1)根据定义计算:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efef9de49a4876d0a67976218e06e15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae313fbab232afc7f446a4594ecd755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff73e07b25348624dc70359d123be18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e4f40035e9af9a59ba66229bf724e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fe025d6b53c528ad5532b12b938742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7777d35fe5d43297d57f035301da9d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301a8dc5ac9da99e3912bacb3f0a40ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b9cad10ee246f0476150e08ffa859a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e103b6056a189eb780186f8d771439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cc4cae46eaa04e005106948bb64b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7b3a09171a8b280f09921e1e34d2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7800f2985d02566dc289e45a0d31b39f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c584fbe5851801456a5998a501efa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54bdd677a544ba8d4393796eb3768425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a23792273c8ac502c8aeab1dc8d1de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
(3)结合上面的知识你能求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90c336e2c16a97127f247bf566fe6c1.png)
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名校
【推荐1】武汉军运会前夕,市园林局进行道路绿化,准备购买A、B两种树苗.已知购买1棵A树苗和2棵B树苗共需400元;购买3棵A树苗和1棵B树苗共需600元.
(1)求每棵A树苗和每棵B树苗售价各为多少元;
(2)若园林局需要购买A、B两种树苗共10000棵,且购买的B树苗不少于A树苗的3倍,总的购买经费不超过128万元,则A树苗最多购买多少棵?
(1)求每棵A树苗和每棵B树苗售价各为多少元;
(2)若园林局需要购买A、B两种树苗共10000棵,且购买的B树苗不少于A树苗的3倍,总的购买经费不超过128万元,则A树苗最多购买多少棵?
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解答题-应用题
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【推荐2】某工厂加工圆柱形的茶叶盒,购买了
块相同的金属板材,已知每块金属板材可以有
,
,
三种裁剪方式,如图,
方式:裁剪成
个圆形底面和
个侧面.
方式:裁剪成
个侧面.
方式:裁剪成
个圆形底面.已知
个圆形底面和
个侧面组成一个圆柱形茶叶盒,且要求圆形底面与侧面恰好配套.现已有
块金属板材按
方式裁剪,其余都按
、
两种方式裁剪.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/00cf6760-a9d7-44e3-8cd5-af5e84dc0fe5.png?resizew=322)
(1)设有
块金属板材按
方式裁剪,
块金属板材按
方式裁剪.
①可以裁剪出圆形底面共 个(用含
的代数式表示),侧面共 有 个(用含
,
的代数式表示);
②当
时,最多能加工多少个圆柱形茶叶盒?
(2)现将
块相同的金属板材全部裁剪完,为了使加工成的圆形底面与侧面恰好配套,则
的值可以是 .(其中
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/00cf6760-a9d7-44e3-8cd5-af5e84dc0fe5.png?resizew=322)
(1)设有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①可以裁剪出圆形底面共 个(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafbc94594b8c877de8883dea10e374c.png)
(2)现将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def174602cfabf037e9c3fc3ecfa01f8.png)
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