用一块宽度为
的长方形铁片弯折成如图所示的梯形流水槽,其中
,
.要使流水的截面面积最大,弯折的长度(
的长)应为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8cc410c8294599e28fc32b3135576f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833513274081280/2842009555263488/STEM/cf1a736264784a8d805b3104b9829a49.png?resizew=175)
20-21九年级下·全国·课后作业 查看更多[1]
(已下线)【北师大版课时练习】 九年级下册 总复习
更新时间:2021-11-01 17:46:09
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【推荐1】已知抛物线
与y轴交于点
.
(1)求c的值.
(2)当
时,求抛物线顶点的坐标.
(3)已知点
,若抛物线
与线段
有两个公共点,结合函数图象,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25379db882e5bb573aa71f80e7ba6ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffe38683d2aedcb995f5e92faa8c35f.png)
(1)求c的值.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0b300053931848c4e00f8c40cfe2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25379db882e5bb573aa71f80e7ba6ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】体育场上,老师用绳子围成一个周长为
的游戏场地,围成的场地是如图所示的矩形
,设
的长为
(
取整数),矩形
的面积为
.
⑴.写出
与
之间的函数关系式,求出
的最值和相应的
的值;
⑵.若矩形
的面积为
且
,请求出此时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0b899ec28caeaaef55143753151bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f935c57deea934138d59bfa60bf8d86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2e78a9b5e46dec10f703e62ad9a863.png)
⑴.写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
⑵.若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3a6788c895abe5b06e0b0a64ecab47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3039c774e00f6520449aa9d4b3c45464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/2/2/1873584597508096/1874204300967936/STEM/5c058c1a83fa4df294e9f229b42ec92a.png?resizew=134)
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【推荐1】如图,在平面直角坐标系中,点
的坐标为
,点
的坐标为
,以
,
为边作矩形
.动点
,
分别从点
,
同时出发,以每秒1个单位长度的速度沿
,
向终点
,
移动.
(1)填空:当移动时间为4秒时,
①四边形
的形状为______;
②
的值为______.
(2)若连接
,当
时,求移动时间为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b67f08afded33059ea945940293df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9055e1408371f84b8df59347ba7309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/53505a43-d289-4174-a4ad-a1f16c8bb318.png?resizew=207)
(1)填空:当移动时间为4秒时,
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09b625f99281283e5bd60c0faaba1d.png)
(2)若连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533205f32369f31adfeba25dfd422955.png)
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名校
【推荐2】如图,在
和
中,
,
,
,点D在
内且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/a011a1ec-1701-44c8-b5d1-c3e1a635cd40.png?resizew=207)
(1)猜想BD与CE的关系并证明你的猜想?
(2)求
的度数;
(3)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/a011a1ec-1701-44c8-b5d1-c3e1a635cd40.png?resizew=207)
(1)猜想BD与CE的关系并证明你的猜想?
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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解答题-作图题
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【推荐1】把一个等腰直角三角形
沿一条线(裁剪线)剪一刀,把裁下的一部分,与剩下部分能拼成一个特殊四边形.请在下面4个图形中分别画出剪裁线和拼出的特殊四边形(工具不限,不必写画法和证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/9e21d9be-07a5-46f6-9055-4e12a0c7d948.png?resizew=302)
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名校
【推荐2】如图:在梯形
中,
,
平分
,延长
至点
,使
,
.
是等腰梯形;
(2)若
,
,求边
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a3a922f7ea64083c415c72259179a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27578b9a142a32733c29ea59dcfe7cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐3】如图1,某学校开展“交通安全日”活动.在活动中,交警叔叔向同学们展示了大货车盲区的分布情况,并提醒大家:坐在驾驶室的司机根本看不到在盲区中的同学们,所以一定要远离大货车的盲区,保护自身安全.小刚所在的学习小组为了更好的分析大货车盲区的问题,将图1用平面图形进行表示,并标注了测量出的数据,如图2.在图2中大货车的形状为矩形,而盲区1为梯形,盲区2、盲区3为直角三角形,盲区4为正方形.
![](https://img.xkw.com/dksih/QBM/2019/2/14/2140612911611904/2141376730685440/STEM/0377f7dbfd19489fbe75e5b4109a0691.png?resizew=568)
请你帮助小刚的学习小组解决下面的问题:
(1)盲区1的面积约是 m2;盲区2的面积约是 m2;(
≈1.4,
≈1.7,sin25°≈0.4,cos25°≈0.9,tan25°≈05,结果保留整数)
(2)如果以大货车的中心A点为圆心,覆盖所有盲区的半径最小的圆为大货车的危险区域,请在图2中画出大货车的危险区域.
![](https://img.xkw.com/dksih/QBM/2019/2/14/2140612911611904/2141376730685440/STEM/0377f7dbfd19489fbe75e5b4109a0691.png?resizew=568)
请你帮助小刚的学习小组解决下面的问题:
(1)盲区1的面积约是 m2;盲区2的面积约是 m2;(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)如果以大货车的中心A点为圆心,覆盖所有盲区的半径最小的圆为大货车的危险区域,请在图2中画出大货车的危险区域.
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解答题-问答题
|
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真题
解题方法
【推荐1】如图,在平面直角坐标系中,矩形
的边
长是方程
的根,连接
,
,并过点
作
,垂足为
,动点
从点
以每秒
个单位长度的速度沿
方向匀速运动到点
为止;点
沿线段
以每秒
个单位长度的速度由点
向点
匀速运动,到点
为止,点
与点
同时出发,设运动时间为
秒![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cea72e0c37257bcfd85a59ef8dd0f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/a616f22b-f736-4014-af90-97aa5e311e72.png?resizew=194)
(1)线段
______;
(2)连接
和
,求
的面积
与运动时间
的函数关系式;
(3)在整个运动过程中,当
是以
为腰的等腰三角形时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c291ae2cc0420ed5178fc34bef48c52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1983c41ebdacc818687e43642f8fb670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d910571a3e7b0ee39fc2e99cc6a80f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cea72e0c37257bcfd85a59ef8dd0f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/a616f22b-f736-4014-af90-97aa5e311e72.png?resizew=194)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a1b84c7ee3e7036c6e49fe272aeb2c.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec1f8a14b2c1570aa076166017ccf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在整个运动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec1f8a14b2c1570aa076166017ccf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在直角梯形
中,
,
,
,
,
,动点
从点
开始沿
边向点
以
速度运动,动点
从点
开始沿
边向点
以
的速度运动.点
、
分别从点
、
同时出发,当其中一点到达端点时,另一点也随之停止运动.设运动时间为
秒.求:
(1)
为何值时,四边形
为平行四边形?
(2)
为何值时,四边形
为矩形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f52b96ec999ba7c3ecf04e13aa91bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea66fef72e9e929f2315f85dc01a6a5.png)
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(2)
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