1 . 目前发射人造天体,多采用多级火箭作为运载工具.其做法是在前一级火箭燃料燃烧完后,连同其壳体一起抛掉,让后一级火箭开始工作,使火箭系统加速到一定的速度时将人造天体送入预定轨道.现有材料科技条件下,对于一个
级火箭,在第
级火箭的燃料耗尽时,火箭的速度可以近似表示为
,
其中
.
注:
表示人造天体质量,
表示第
(
)级火箭结构和燃料的总质量.
给出下列三个结论:
①
;
②当
时,
;
③当
时,若
,则
.
其中所有正确结论的序号是___________ .
![](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/c0532411d57ea180b894ad7ecc3c3cd2.png)
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbc231de2cd997f8abb79585f057f48.png)
注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1448ec3239cfb8c7872e101ab7405e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476d6d49c2989ac6cfd0c06149df251c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2429b6a233ef2f66677b15bc11a13294.png)
给出下列三个结论:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc1c64bd18987615bd40f41d4cf4a7c.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493102857cb6471c2d1f2e35c3872b55.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ca25328bd480836d66a2b33b41b00f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5becaecdd2a5481cf52f31e4930368.png)
其中所有正确结论的序号是
您最近一年使用:0次
解题方法
2 . 已知函数
具有下列性质:
①当
时,都有
;
②在区间
上,
单调递增;
③
是偶函数.
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c69303bd9eccb3ccb55c9e4cd03a8a3.png)
________ ;函数
可能的一个解析式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e32125207addc3fdb92ceb0ec80ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9c7ce3315926725a1583323ec15875.png)
②在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c69303bd9eccb3ccb55c9e4cd03a8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
您最近一年使用:0次
名校
解题方法
3 . 已知
是抛物线
的焦点,
是该抛物线上的两点,
,则线段
的中点到
轴的距离为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e1bc08cc69d3d8e73b990f1236ed5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
2024-03-27更新
|
855次组卷
|
2卷引用:北京市丰台区2023-2024学年高三下学期综合练习(一)数学试题
名校
解题方法
4 . 矩形
中,
,
,且
分为
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0d84e7f64f2ad466051a7e1adf69f2.png)
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0d84e7f64f2ad466051a7e1adf69f2.png)
您最近一年使用:0次
2024-01-22更新
|
688次组卷
|
3卷引用:北京市丰台区2023-2024学年高三上学期期末练习数学试卷
5 . 如图所示,在棱长为2的正方体
中,
是线段
上的动点,则下列说法正确的有______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/afefb78b-33c5-4cae-9f11-7b4f200b49c6.png?resizew=142)
①平面
平面
;
②
的最小值为
;
③若直线
与
所成角的余弦值为
,则
;
④若
是
的中点,则
到平面
的距离为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/afefb78b-33c5-4cae-9f11-7b4f200b49c6.png?resizew=142)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aba59315c1e7bb85297d9f80d6cbc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
③若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655c413f509068d30b165f9d92bdba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88ec535afa71321a19dd82af3bc364a.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa085ddda8cafab99ea5cf738abb3f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98ee8ce2c56dccae6b63b5a9ca022b8.png)
您最近一年使用:0次
6 . 近日北方地区普遍降雪,某幼儿教师手工课上带孩子们做描述雪花形状的图案:从一个正三角形开始,把每条边分成三等份,然后以各边的中间一段为底边分别向外作正三角形,再去掉底边.反复进行这一过程,就得到一条“雪花”状的曲线.设原正三角形(图①)的边长为1,把图①,图②,图③,图④中图形的面积依次记为数列
的前四项,则数列
的通项公式为_____________ ,如果这个作图过程可以一直继续下去,那么“科赫雪花”的面积将趋近于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/da8c63cf-168f-48dd-8a8f-cecaddb69e71.png?resizew=394)
您最近一年使用:0次
2024-01-25更新
|
352次组卷
|
3卷引用:北京市丰台区怡海中学2023-2024学年高二上学期期末模拟练习数学试题(2)
北京市丰台区怡海中学2023-2024学年高二上学期期末模拟练习数学试题(2)河北省石家庄市第二十七中学2024届高三上学期金太阳联考数学试题(已下线)考点11 由实际问题探究递推关系 2024届高考数学考点总动员
7 . 经过点
,斜率为3的直线方程为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69abe959988e4c8c0739f5857ccfb0f.png)
您最近一年使用:0次
2024-01-13更新
|
454次组卷
|
2卷引用:北京市丰台区怡海中学2023-2024学年高二上学期期末模拟练习数学试题(2)
8 . 已知函数
,关于x的方程
有3个不同的解,则m的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8002d9395dcf05f9ba0379ce969f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.png)
您最近一年使用:0次
2023-12-23更新
|
503次组卷
|
4卷引用:北京市丰台区第二中学2023-2024学年高二下学期3月月考数学试题
解题方法
9 . 设数列
前
项和为
,满足
,
且
,
,则下列命题正确的是____________ .①
;②数列
为等差数列;③当
时,
有最大值;④设
,则当
或
时,数列
的前
项和取最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0456970eff61052b7e72339923d5dbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d66c520b8ab37c49a385db8c90432af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2a6d5d85755462b0241d3749907e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b1672953164c806fee8e7d6d8336c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230ae9538a1b0ec62c3491cbce25df8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ec5d76db9bd05547932966c9913dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe08722cf9300fe188dbbb71989c06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
名校
解题方法
10 . 已知数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ef7fade67001f9d4f7825857c17567.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
您最近一年使用:0次
2023-12-17更新
|
998次组卷
|
5卷引用:北京市丰台区2023-2024学年高二上学期期末模拟数学试题