某村启动“脱贫攻坚”项目,根据当地的地理条件,要在一座高为1000m的上种植一种经济作物.农业技术人员在种植前进行了主要相关因素的调查统计,结果如下:
①这座山的山脚下温度约为22°C,山高h(单位:m)每增加100m,温度T(单位:°C)下降约0.5°C;
②该作物的种植成活率p受温度T影响,且在19°C时达到最大.大致如表:
③该作物在这座山上的种植量w受山高h影响,大致如图1:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/a13dc53f-210e-4eae-86e0-457a1b19cf07.png?resizew=242)
(1)求T关于h的函数解析式,并求T的最小值;
(2)若要求该作物种植成活率p不低于92%,根据上述统计结果,山高h为多少米时该作物的成活量最大?请说明理由.
①这座山的山脚下温度约为22°C,山高h(单位:m)每增加100m,温度T(单位:°C)下降约0.5°C;
②该作物的种植成活率p受温度T影响,且在19°C时达到最大.大致如表:
温度T°C | 21 | 20.5 | 20 | 19.5 | 19 | 18.5 | 18 | 17.5 |
种植成活率p | 90% | 92% | 94% | 96% | 98% | 96% | 94% | 92% |
③该作物在这座山上的种植量w受山高h影响,大致如图1:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/a13dc53f-210e-4eae-86e0-457a1b19cf07.png?resizew=242)
(1)求T关于h的函数解析式,并求T的最小值;
(2)若要求该作物种植成活率p不低于92%,根据上述统计结果,山高h为多少米时该作物的成活量最大?请说明理由.
更新时间:2020-05-04 08:43:45
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】甲乙两车在高速公路上同向匀速行驶,甲车在前,乙车在后,乙车第一次确认与前方甲车的距离为
.
后再次确认与前方甲车的距离为
,乙车开始均匀减速,每秒减少
.设行驶的时间为t(单位:
),甲乙两车之间的距离为y(单位:
),甲乙两车的车速与t的关系如图1所示,y与t的关系如图2所示,请解决以下问题:
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717371942682624/2736380991012864/STEM/489e2a65-6f9e-4a00-a555-298cb512d7ae.png)
(1)
______,
________;
(2)求c的值,并说出点M的实际意义;
(3)如果甲乙两车从
开始一起均匀减速,甲车每秒减少
,乙车每秒减少
,要保持与前方甲车至少有
的安全距离,d的最小值为多少?
【提示:距离=平均速度×时间,平均速度
(其中
是开始时的速度,
是t秒时的速度)】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3e80d2808bf862c9b6169ca4deedfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a165cec4c1b652bffb265e52e2334f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e55c43b32c647e9d23bfcfc9920458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88406703f9d15b1020c4ccdeddb24683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65502a7ea4d1ce6d6d8c720845c73e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717371942682624/2736380991012864/STEM/489e2a65-6f9e-4a00-a555-298cb512d7ae.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)求c的值,并说出点M的实际意义;
(3)如果甲乙两车从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a165cec4c1b652bffb265e52e2334f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1ab93fb343076acdb67e8c0b5d19a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff63db383a4685772d9a81537794f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f2763f98da42207de633bf906d9757.png)
【提示:距离=平均速度×时间,平均速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad5697a2596514509792d6376674aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64731fec2c19cf0d7cbe411e83e42d26.png)
您最近一年使用:0次
解答题-作图题
|
困难
(0.15)
【推荐2】某班数学兴趣小组对函数
的图象与性质进行了探究,探究过程如下,请补充完整.
(1)自变量
的取值范围是
,
与
的几组对应值列表如下:
其中,
______;
(2)根据上表数据,在如图所示的平面直角坐标系中画出该函数的图象:
①函数
可以看成是由函数
先向______平移______个单位长度,再向______平移______个单位长度得到的;
②函数
的图象关于______成中心对称;
③写出这个函数的一条性质:______________________________;
④结合你所画的函数图象,直接写出不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0868c69690dec6996ab80c4fd92016db.png)
(1)自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | … | ![]() | ![]() | ![]() | ![]() | 0 | ![]() | ![]() | 2 | 3 | 4 | 5 | 9 | … |
![]() | … | ![]() | 1 | ![]() | 0 | ![]() | ![]() | 10 | 6 | 4 | ![]() | 3 | ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)根据上表数据,在如图所示的平面直角坐标系中画出该函数的图象:
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b2816b29b58b052fabf7705253346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b2816b29b58b052fabf7705253346.png)
③写出这个函数的一条性质:______________________________;
④结合你所画的函数图象,直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab66ffb507afde39a16a34874a02c270.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】已知抛物线
(
)与x轴交于A,B两点(点B在x轴正半轴),与y轴交于点C,连接
,
,
.
(1)求抛物线的解析式;
(2)若点D在点B,C之间的抛物线上运动(不与点B,C重合),连接
交
于点E,连接
.记
,
的面积分别为
,
,求
的最大值;
(3)已知抛物线的顶点的为G,过点G的直线l与抛物线的另一个交点为P,直线l与直线
:
交于点F,过点F作
的垂线,交抛物线于点Q,过
的中点M作
于点N.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13395cc6b33beadf1ccf7b65ea4b8bfc.png)
(1)求抛物线的解析式;
(2)若点D在点B,C之间的抛物线上运动(不与点B,C重合),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e72a855bb6d80737099e412ed52a26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
(3)已知抛物线的顶点的为G,过点G的直线l与抛物线的另一个交点为P,直线l与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b60ffaded4bbcef7012aad9c4a4fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3666cc33865d939a2ef627e68e7fc756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00608cf686699d33041875c36e63e965.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】请解答下列各题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/72ddab80-2104-443d-911a-156e89fcc3a0.png?resizew=561)
(1)如图1,锐角
中,分别以
、
为边向外作等腰直角
和等腰直角
,使
,
,
,连接
,
,试猜想
与
的数量关系为_________.
(2)如图2,锐角
中分别以
、
为边向外作等腰
和等腰
,使
,
,
,连接
、
,试猜想
与
的大小关系,并说明理由.
(3)如图3,在
中,
,以
为直角边,A为直角顶点向外作等腰直角
,连接
,若
,
,求
长.
(4)如图4,已知在平面直角坐标系
中,
为坐标原点,
,
,过点
作直线
轴,点
是直线
上的一个动点,线段
绕点
按逆时针方向旋转
得到线段
,则
的最小值为___________.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/72ddab80-2104-443d-911a-156e89fcc3a0.png?resizew=561)
(1)如图1,锐角
![](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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cef0e7f62849015e2a5c4d7cbaf7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图2,锐角
![](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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fbbe04651b37e1520bb9a7bafed509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(4)如图4,已知在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777a051cd321b870301db325c035b3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521d2cbdff8483ebba708857163ef1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165a501b2e6a3acc46212e59a166c053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d2300f39ecae9cbda3d17006818ddf.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】如图,已知直线l1:y=
与直线l2:y=﹣2x+16相交于点C,l1、l2分别交x轴于A、B两点.矩形DEFG的顶点D、E分别在直线l1、l2上,顶点F、G都在x轴上,且点G与点B重合.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912599883186176/2917738263404544/STEM/43758da1-1a00-402f-99ed-ae56323a0cd3.png?resizew=275)
(1)求△ABC的面积;
(2)求矩形DEFG的边DE与EF的长;
(3)若矩形DEFG从原地出发,沿x轴的反方向以每秒1个单位长度的速度平移,设移动时间为t(0≤t≤12)秒,矩形DEFG与△ABC重叠部分的面积为S,直接写出S关于t的函数关系式,并写出相应的t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f985304694d9ba8792aace1d7686c7d9.png)
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912599883186176/2917738263404544/STEM/43758da1-1a00-402f-99ed-ae56323a0cd3.png?resizew=275)
(1)求△ABC的面积;
(2)求矩形DEFG的边DE与EF的长;
(3)若矩形DEFG从原地出发,沿x轴的反方向以每秒1个单位长度的速度平移,设移动时间为t(0≤t≤12)秒,矩形DEFG与△ABC重叠部分的面积为S,直接写出S关于t的函数关系式,并写出相应的t的取值范围.
您最近一年使用:0次