疫情过后,宅居已久的人们成为了行走的“多肉”,某运动器材商店看准这一商机预购进一批瘦身器材,已知
架单车和
架跑步机的需
元,
架单车和
架跑步机需
元.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/5547c4e2-f124-4217-8c07-9386773b787c.png?resizew=307)
(1)请问单车和跑步机的单价各是多少元?
(2)后经协商,供货商承诺单车可
折供货,但跑步机价格不变,若该运动器材商店预备购进单车和跑步机共
架,且要求单车数量不高于跑步机数量的
倍,请问如何进货才能使得进货款最少,最少为多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f8ebc9c1eaedadae2c2120bb5a2d27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6091b892dcbffe7d1b5e0e44e65a4077.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/5547c4e2-f124-4217-8c07-9386773b787c.png?resizew=307)
(1)请问单车和跑步机的单价各是多少元?
(2)后经协商,供货商承诺单车可
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
更新时间:2022-09-14 22:49:24
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相似题推荐
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【推荐1】已知关于x的不等式
的解集为
或
.
(1)求a,b的值;
(2)当
时,不等式
的解区间为
,求
的最小值和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9deeb02676b13db2735699803f8c601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20c78ad990e2424f4ece6a926e17bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d5c65d76b90bafe1a009ef1693af2f.png)
(1)求a,b的值;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff9955757050180c37fa3fc3241439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07751999674d9c162cefb477ddec95b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64da75a02173c2a5eb40f4c68d0f4f36.png)
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解题方法
【推荐2】已知二次函数
,其中
,
满足
,点
在函数图像上.
(1)求二次函数的表达式.
(2)若过
轴上的动点
,比例系数分别为
,
的两个一次函数的图象与二次函数
的图像都有且只有一个交点,求证:
.
(3)二次函数的图象上是否存在这样的点,其横坐标为一个正整数,纵坐标为一个完全平方数?若存在,求出这个点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97a3429eeb4a7b198d31645feace71a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b80443b7b36fd9f21ba4324183ddc44.png)
(1)求二次函数的表达式.
(2)若过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49529aec71a57b26c79a036283dbb5a.png)
(3)二次函数的图象上是否存在这样的点,其横坐标为一个正整数,纵坐标为一个完全平方数?若存在,求出这个点的坐标;若不存在,请说明理由.
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【推荐3】材料一:如果一个三位正整数满足十位数字大于个位数字,且十位数字与个位数字之和等于百位数字,那么称这个数为“下降数”.例如:
,满足
,且
,所以
是“下降数”;
,满足
,但
,所以
不是“下降数”.
材料二:对于一个“下降数”
(
,
,
,且
,
,
为整数),交换其百位和十位得到
,规定
,例如:321是“下降数”,
,
.
(1)判断:743 “下降数”,523 “下降数”(填“是”或“不是”);
(2)设m为任意一个“下降数”,求证:
能被11整除;
(3)若
,
都是“下降数”,其中
,
(
,
,
,
,且
,
,
,
均为整数),若
=117,求满足条件的
和
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb3a3a191e6852428d56fc1f484dac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6446d840ed9f208a98f59fec9f7630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc114012e9d5888ca8ac6b6eacd306e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3e22a3ff259172de8c9411405650f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabbadab93c4c9a909482e52d8d2de16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523a449a62805b21e5ef6769b93124eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a352a9a6e0a6e3ac462f0004ba05125f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abe6ccdbf4e5000d471b493f5982d98.png)
材料二:对于一个“下降数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a66194bf888fe60458a2e32a98710a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40654a0135a2713cfe30a53445cbe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3c035b9c9a3ef570ba56fd4da127702.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c526241f17d718dbe18df1e1a796a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef07608cb0afaaaa571679e6ba4e8ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688d06c7524da82f8ed91606869649dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e629a01f4f8adb0edee9d05a2ac61c1.png)
(1)判断:743 “下降数”,523 “下降数”(填“是”或“不是”);
(2)设m为任意一个“下降数”,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bb215f28e5eea7ff4c7ca5ee9e2216.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b8350613bfaf2c964cc2905bde21b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a900aeb7d696bc3af5b92dacd87bd729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】如图,抛物线
与
轴交于点
,与
轴交于
、
两点,
点在
点左侧.点
的坐标为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/761e4cfc-d086-4231-9f2b-81826af474f5.png?resizew=208)
(1)求抛物线的解析式;
(2)若点
是线段
下方抛物线上的动点,求四边形
面积的最大值;
(3)若点
在
轴上,点
在抛物线上.是否存在以
、
、
、
为顶点且以
为一边的平行四边形?若存在,求点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d24715f6c7e8136bbccedfebc7bcd39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05581788393270ca7057397c95a7ef7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/761e4cfc-d086-4231-9f2b-81826af474f5.png?resizew=208)
(1)求抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】心理学家通过实验发现:初中学生听讲的注意力随时间变化,讲课开始时,学生注意力逐渐增强,中间有一段平稳状态,随后开始分散.学生注意力指标数
随时间表
(分钟)变化的函数图象如下.当
时,图像是抛物线的一部分,当
时和
时,图像是线段.
(1)当
时,求注意力指标数
与时间
的函数关系式;
(2)一道数学探究题需要讲解24分钟,问老师能否经过恰当安排,使学生在探究这道题时,注意力指标数不低于45?请通过计算说明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443e30092441f6cabe71a67c60ee733c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c987ded553c090c1e2fcd28b71b5b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f951ef618228609a625eba73ff417d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/2b3864f1-994c-4aa5-adbb-90beaf08cf90.png?resizew=274)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443e30092441f6cabe71a67c60ee733c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)一道数学探究题需要讲解24分钟,问老师能否经过恰当安排,使学生在探究这道题时,注意力指标数不低于45?请通过计算说明.
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