已知关于x的一元二次方程
.
(1)求证:方程总有两个实数根;
(2)若
的两边
,
的长是这个方程的两个实数根,第三边
的长为5,当
是等腰三角形时,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35534d2ef66f97127fac44a9de89987.png)
(1)求证:方程总有两个实数根;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2023-07-04 13:21:42
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解答题-证明题
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适中
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名校
【推荐1】(1)解方程:
.
(2)如图,在矩形
中,
是
上一点,且
,过点
作
于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3580fd58a7f8ef41d656b33a25eed4.png)
(2)如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518586d91b63569fc317b323835a0c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bc0cc876a60c8cbdccc6a9a0b5b993.png)
![](https://img.xkw.com/dksih/QBM/2021/10/9/2825664442777600/2829916435513344/STEM/89154df0-521c-432b-b065-7320a972498e.png)
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【推荐2】按要求解下列方程
(1)
. (配方法)
(2)
(公式法)
(3)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52e3adabfbf5ca5dd77e1dbbbf0686e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3081ae0ab4cd1e4b43862132d8af828a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a32a6e3aa83245bb1d3cb75d335ab63.png)
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解答题-问答题
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【推荐1】某商场销售一批衬衫,平均每天可售出
件,每件盈利
元.为了扩大销售,增加盈利,商场采取了降价措施.假设在一定范围内,衬衫的单价每降1元,商场平均每天可多售出2件,设衬衫的单价降了x元.
(1)完成下列表格(用含x的式子填空).
(2)当衬衫的单价降多少元时,商场销售这批衬衫每天可盈利
元,且对消费者更有利?
(3)能否通过降价使商场销售这批衬衫每天盈利
元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
每天的销售量/件 | 每件衬衫的利润/元 | |
降价前 | ||
降价后 |
(2)当衬衫的单价降多少元时,商场销售这批衬衫每天可盈利
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f758fcf0427957c498c592644e9369.png)
(3)能否通过降价使商场销售这批衬衫每天盈利
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69c0fc5595aadf8e59662c20c515b58.png)
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解答题-证明题
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【推荐2】已知关于x的方程
,
(1)证明:当a取任何实数时,方程都是一元二次方程;
(2)当
时,解这个方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38036e7fb88178416764d068d4517f7e.png)
(1)证明:当a取任何实数时,方程都是一元二次方程;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
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解答题-问答题
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适中
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【推荐1】一个等腰三角形的周长为25cm.
(1)已知腰长是底边长的2倍,求各边的长;
(2)已知其中一边的长为6cm.求其它两边的长.
(1)已知腰长是底边长的2倍,求各边的长;
(2)已知其中一边的长为6cm.求其它两边的长.
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解答题-计算题
|
适中
(0.65)
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【推荐2】阅读材料:若
,求m、n的值.
解:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf72e8aad5b0e809dc97ecb8d28a443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e422e80844a1afe72af1df78894e6a.png)
,
,
.
根据你的观察,探究下面的问题:
(1)已知
,求
的值;
(2)已知等腰
的三边长a、b、c都是正整数,且满足
,求△ABC的周长;
(3)已知
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ab3cd8d4125c4ad18333dff0cce5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf72e8aad5b0e809dc97ecb8d28a443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8989fead62857fb90b5199bdcad51654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e422e80844a1afe72af1df78894e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
根据你的观察,探究下面的问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d29d4752c6716c722b10c4660485b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
(2)已知等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04bd57a622ed5e60cf626134072123f7.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45900deae0489e87fe448948e8091c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1cee2fab363f514135eb29602c309f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e823000035b4482d4868da22c0f9fc7.png)
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解答题-问答题
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【推荐1】如图,在平面直角坐标系中,
为坐标原点,
的边
在
轴上,
、
、
三点的坐标分别为
,
,
,一动点
从点
出发,以每秒
个单位长度的速度沿射线
匀速运动,设点
运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/122e75f4-43ec-4001-98ff-f5240fe31f4f.png?resizew=287)
(1)
的面积
_______;
(2)若点
恰好线段
的垂直平分线上,求此时
的值;
(3)当点
在线段
上运动时,在
轴的正半轴上是否存在点
,使
与
全等?若存在,请求出
的值并求出此时点
的坐标:若不存在,请说明理由;
(4)连结
,若
为等腰三角形,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3738bb3fced399273145e04ec3955b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed20a818998b0c8050fef1f0aa64d2e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3154ef52152b50cf55b4983ad1cfb001.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/122e75f4-43ec-4001-98ff-f5240fe31f4f.png?resizew=287)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)若点
![](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/36a1b09c653185842513e24ebba60bb3.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.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/0fdc02f00cf00a6dfd88b53a90f1f7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(4)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】有一条长为
的细绳围成一个等腰三角形.
(1)如果腰长是底边长的3倍,那么底边长是多少?
(2)能围成一边长为
的等腰三角形吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2eb8ac733873fb3e728399ac856f16.png)
(1)如果腰长是底边长的3倍,那么底边长是多少?
(2)能围成一边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9938aea41f03701b233dee15809f2126.png)
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