1 . 已知:平面内的动点P到定点为
和定直线
距离之比为
,
(1)求动点P的轨迹曲线C的方程;
(2)若直线
与曲线C的交点为M,N,点
,
当满足 a 时,求证: b .
①
;
②
;
③直线
过定点,并求定点的坐标.
④直线
的斜率是定值,并求出定值.
请在①②里选择一个填在a处,在③④里选择一个填在b处,构成一个真命题,在答题卡上陈述你的命题,并证明你的命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求动点P的轨迹曲线C的方程;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5bd66dd6d5e09ff0893a938aed56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315a24a74c99dfa18e6d8b1b5220724b.png)
当满足 a 时,求证: b .
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123a37d2688c0db395c86167f7fb9a52.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4808dca4874ae8142a91ce5605f9d7b.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
④直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
请在①②里选择一个填在a处,在③④里选择一个填在b处,构成一个真命题,在答题卡上陈述你的命题,并证明你的命题
您最近一年使用:0次
2 . 已知数列
满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8323901a49cac29afd7d62864f088077.png)
(1)求数列
的通项公式.
(2)设
,其中e是自然对数的底数,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9d14639c0fa53eb22c53543f8019b4.png)
(3)设
为数列
的前
项和,实际上,数列
存在“极限”,即为:存在一个确定的实数S,使得对任意正实数u都存在正整数m满足当
时,
(可以证明S唯一),S称为数列
的极限.试根据以上叙述求出数列
的极限S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e1138c1ead9ab88bd35beac4cfe272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8323901a49cac29afd7d62864f088077.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0884298be563c93c7ef051f804c921e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9d14639c0fa53eb22c53543f8019b4.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce224c28ca451c4f105dc3b077736cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856b137a34d2d5b20671b7a3c7a29606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98739bf7d145427ffe5837c2dabbd978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce224c28ca451c4f105dc3b077736cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce224c28ca451c4f105dc3b077736cb.png)
您最近一年使用:0次
解题方法
3 . 如图,在四棱锥
中,侧棱
平面
,底面四边形
是矩形,
,点
、
分别为棱
、
的中点,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/feb0307f-0b41-42a8-8cf5-9a37f9538ba6.png?resizew=175)
(1)若
,求证:直线
平面
;
(2)若
,从下面①②两个条件中选取一个作为已知,证明另外一个成立.
①平面
与平面
的交线为直线
,
与直线
成角的余弦值为
;
②二面角
的余弦值为
.
注:若选择不同的组合分别作答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888d60eea4792374fda946b0a7b2831c.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/feb0307f-0b41-42a8-8cf5-9a37f9538ba6.png?resizew=175)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10d00f6d7d9019f8b964bd4e19d629a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982d01f052709b72afeaf1015fc7acc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149596fee6ed1e2d19fd8dadc14a8baf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
②二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f1b90a3031fcd75754365a32b65a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1145c162038df3c7184d9201c628e.png)
注:若选择不同的组合分别作答,则按第一个解答计分.
您最近一年使用:0次
名校
解题方法
4 . 已知平面上一动点
到定点
的距离比到定直线
的距离小
,记动点
的轨迹为曲线
.
(1)求
的方程;
(2)点
为
上的两个动点,若
恰好为平行四边形
的其中三个顶点,且该平行四边形对角线的交点在第一、三象限的角平分线上,记平行四边形
的面积为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7b76d897de678faaf8221bafe217d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb93b19779fab3f7a6991633933a364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3687b9de2cd647ee49c4b9b01eac438a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45bd92770adca80f9aa3d2e4b7e106a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f790a1d74e757158ccac343e5dac6af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab3e0100e6788858ab43861933dd248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab3e0100e6788858ab43861933dd248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4532e8175640973b48fa2bb4f53310.png)
您最近一年使用:0次
2024-04-03更新
|
1504次组卷
|
4卷引用:辽宁省八市八校2024届度高三第二次联合模拟考试数学试题
辽宁省八市八校2024届度高三第二次联合模拟考试数学试题2024届辽宁省名校联盟高考模拟卷(调研卷)数学试题(一)(已下线)专题8.4 抛物线综合【八大题型】(已下线)重难点14 圆锥曲线必考压轴解答题全归类【十一大题型】(举一反三)(新高考专用)-1
5 . 若函数
在定义域
上满足
,且
时
,定义域为
的
为偶函数.
(1)求证:函数
在定义域上单调递增.
(2)若在区间
上,
;
在
上的图象关于点
对称.
(i)求函数
和函数
在区间
上的解析式.
(ii)若关于x的不等式
,
对任意定义域内的
恒成立,求实数
存在时,
的最大值关于a的函数关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea20bf4103d4a86ce2dedc8cbf73498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d991a665834f1957063731202084570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c01b3dea6d0449097da0edc9130ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b577bf976fc3acd92b4af89be960359f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e110165a664ac7a77e70a6a46078602b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
(i)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d991a665834f1957063731202084570.png)
(ii)若关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2846c1cedbe564d20873d2b4d6f426aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6232dc74b15e4acb0ac3482a1cbe6a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157416e0bb98baff8059b9ef0e123ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2023-12-14更新
|
944次组卷
|
6卷引用:辽宁省大连市2022-2023学年高一上学期期末数学模拟试题
辽宁省大连市2022-2023学年高一上学期期末数学模拟试题(已下线)高一上学期期末考试解答题压轴题50题专练-举一反三系列江西省上饶市广丰区丰溪中学2023-2024学年高一上学期期末模拟数学试题福建省福州市九师教学联盟2023-2024学年高一上学期1月联考数学试题(已下线)高一数学开学摸底考 01-人教A版2019必修第一册全册开学摸底考试卷山东省德州市万隆中英文高级中学2023-2024学年高二下学期6月月考数学试题
6 . 小颖同学在学习探究活动中,定义了一种运等“
”:对于任意实数a,b,都有
,通过研究发现新运算满足交换律:
.小颖提出了两个猜想:
,
,
,①
;②
.
(1)请你任选其中一个猜想,判断其正确与否,若正确,进行证明;若错误,请说明理由;(注:两个猜想都判断、证明或说明理由,仅按第一解答给分)
(2)设
且
,
,当
时,若函数
在区间
上的值域为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4235fe8a6cf0446dbf476822b6dbbce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7ff4ffa27279dbf509cfb852446813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6593a700bf3e89107556454666b787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525c1a68848e95e6b419e0bbec3c0957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b648347b0e5ed2bdc821dc7cf50d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8d87094a7c50f062fa23902cd23c20.png)
(1)请你任选其中一个猜想,判断其正确与否,若正确,进行证明;若错误,请说明理由;(注:两个猜想都判断、证明或说明理由,仅按第一解答给分)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d386474416a278ca29be6075fa076d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49910fc853928999a0acbcc67f4c295c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733c4ee92975bec9a52b9b2d544d790f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a964eadb835069b591f479b7c67e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2023-12-11更新
|
318次组卷
|
2卷引用:辽宁省名校联盟2023-2024学年高一上学期12月份联合考试数学试题
解题方法
7 . (1)已知______,试比较M,N的大小.从下列两个条件中选择其中一个填入横线中,并解答问题.
①
,
,②
,
.
(2)若
,证明:
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c8279b4d5ab7bd609dd93ec6a6f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e676cb18451a57de7f796366178eabfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e2813be505811d244989063275115e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26798d30978791b8c7efd098fd39d4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c860e0ac9cab0f5f4b636eff55d1c3.png)
您最近一年使用:0次
名校
解题方法
8 . 如图,已知抛物线,点
,过点
任作两条直线,分别与抛物线
交于A,B与C,D.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab81123b73bb74cdc54cf4ef3733cca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8cd0ae86bef6539ef0e4a34b828c57.png)
(ⅰ)找到满足的等量关系;
(ⅱ)交于点
,证明:点
在定直线上.
您最近一年使用:0次
2024-03-26更新
|
1358次组卷
|
2卷引用:辽宁省沈阳市东北育才学校高中部2023-2024学年高三第六次模拟考试暨假期质量测试数学试题
名校
解题方法
9 . 甲、乙两名同学积极参与体育锻炼,对同一体育项目,在一段时间内甲进行了6次测试,乙进行了7次测试.每次测试满分均为100分,达到85分及以上为优秀.两位同学的测试成绩如下表:
(1)从甲、乙两名同学共进行的13次测试中随机选取一次,求该次测试成绩超过90分的概率;
(2)从甲同学进行的6次测试中随机选取4次,设X表示这4次测试成绩达到优秀的次数,求X的分布列及数学期望EX;
(3)从乙同学进行的7次测试中随机选取3次,设Y表示这3次测试成绩达到优秀的次数,试判断数学期望EY与(2)中EX的大小.(结论不要求证明)
次数 同学 | 第一次 | 第二次 | 第三次 | 第四次 | 第五次 | 第六次 | 第七次 |
甲 | 80 | 78 | 82 | 86 | 95 | 93 | — |
乙 | 76 | 81 | 80 | 85 | 89 | 96 | 94 |
(2)从甲同学进行的6次测试中随机选取4次,设X表示这4次测试成绩达到优秀的次数,求X的分布列及数学期望EX;
(3)从乙同学进行的7次测试中随机选取3次,设Y表示这3次测试成绩达到优秀的次数,试判断数学期望EY与(2)中EX的大小.(结论不要求证明)
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2023-03-27更新
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1431次组卷
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5卷引用:辽宁省沈阳市东北育才学校2023届高三下学期适应性考试数学试题
名校
10 . 某单位有
名职工,通过抽验筛查一种疾病的患者.假设患疾病的人在当地人群中的比例为
.专家建议随机地按
(
且为
的正因数)人一组分组,然后将各组
个人的血样混合再化验. 如果混管血样呈阴性,说明这
个人全部阴性;如果混管血样呈阳性,说明其中至少有一人的血样呈阳性,就需要对每个人再分别化验一次.设该种方法需要化验的总次数为
.
(1)当
时,求
的取值范围并解释其实际意义;
(2)现对混管血样逐一化验,至化验出阳性样本时停止,最多化验
次.记
为混管的化验次数,当
足够大时,证明:
;
(3)根据经验预测本次检测时个人患病的概率
,当
时,按照
计算得混管数量
的期望
;某次检验中
,试判断个人患病的概率为
是否合理.(如果
,则说明假设不合理).
附:若
,则
,
,
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c8578f06897aa6fb84aa95c797d3d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc329b32ecf0f0532d09a8a21343e8cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250629ad29d377f3d3ab229dd328d027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d23b2cf8ebf243293af6e316925d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)现对混管血样逐一化验,至化验出阳性样本时停止,最多化验
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b481119a43237e40b4ab19b59ec27dce.png)
(3)根据经验预测本次检测时个人患病的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31251aec52e0833858cb3041ffb2120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f369ea461908186cb8342816785e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ff1f527ec44d057dac7ad8b86d79bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52663ed54c9167744ad6ed29dd2b07d1.png)
附:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93446343720ebe5e94cffd4c15683c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4831218b03a6b79a839352bf6b037463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bc7b9f904e37882539ded1d462008e.png)
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