名校
解题方法
1 . 如图,矩形
中,
,
为边
的中点,将
沿直线
翻折至
的位置.若
为线段
的中点,在
翻折过程中(
平面
),给出以下结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/75579b14-d042-4f3f-94ed-2310a0e41d23.png?resizew=198)
①存在
,使
;
②三棱锥
体积最大值为
;
③直线
平面
.
则其中正确结论的序号为_________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8588e18e27bfebf7c81c7e3c7efb1149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/75579b14-d042-4f3f-94ed-2310a0e41d23.png?resizew=198)
①存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2181c78134c310f746eab44b9124e63b.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb79f948d408ab4fb6708bde172c5e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b9f96b8ecc3cb000bb2f030809f225.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c70966a318ef8ecf874257f5c5e5db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
则其中正确结论的序号为
您最近一年使用:0次
2023-03-13更新
|
365次组卷
|
3卷引用:宁夏六盘山高级中学2023届高三第一次模拟数学(文)试题
宁夏六盘山高级中学2023届高三第一次模拟数学(文)试题河南省许昌市鄢陵县职业教育中心(升学班)2022-2023学年高二下学期期中考试数学试题(已下线)第15讲 8.6.3平面与平面垂直(第2课时)-【帮课堂】(人教A版2019必修第二册)
名校
解题方法
2 . 如图所示,在长方体
中,
,点
是棱
上的一个动点,若平面
交棱
于点
,给出下列命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/cc4fce1e-276b-4eed-9181-b794bbb34d6d.png?resizew=184)
①四棱锥
的体积恒为定值;
②存在点
,使得
平面
;
③对于棱
上任意一点
,在棱
上均有相应的点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
平面
;
④存在唯一的点
,使得截面四边形
的周长取得最小值.
其中真命题的是_____________ . (填写所有正确答案的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b378805114b83f76fcece53698a28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dce95726804cf91de63f07b37c65da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb16f7dbc4b9993c4efa0764df1d8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e92aadc02ae971ed29bb2db51b012f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17230625e72d3a9c6d72ff61019ff61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/cc4fce1e-276b-4eed-9181-b794bbb34d6d.png?resizew=184)
①四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7c649d4bbd61eaef51e529ef9b1204.png)
②存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bac4ff764651106d9ab46855f20331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7759e75f16985d39b854e45774f06a86.png)
③对于棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb16f7dbc4b9993c4efa0764df1d8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c23c66ab7d74f51cb4b79d1029fb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc3e8a1475b983d1a4295db0e16d4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7003aee0b4b85f0fdd48ca9ae5826d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bed42b435afda8e8c47dd0da8e4a1f.png)
④存在唯一的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422676748fd5d893c0e4331fee24e473.png)
其中真命题的是
您最近一年使用:0次
2022-10-07更新
|
343次组卷
|
11卷引用:宁夏银川一中2021届高三第六次月考数学(理)试题
宁夏银川一中2021届高三第六次月考数学(理)试题宁夏银川一中2021届高三第六次月考数学(文)试题黑龙江省大庆市大庆实验中学2019-2020学年高三上学期期中数学(文)试题四川省内江市2019-2020学年高二上学期期末数学(理)试题湖南省邵阳市邵东县第十中学2020届高三下学期模拟考试数学(理)试题黑龙江省鹤岗市第一中学2020-2021学年高二10月月考数学(理)试题河北省张家口市第一中学2021届高三(衔接班)上学期期中数学试题(已下线)专题4.5 立体几何中探索性问题-玩转压轴题,进军满分之2021高考数学选择题填空题四川省成都市第八中学校2022-2023学年高三上学期第一次摸底考试文科数学试题河南省顶级名校2022-2023学年高三上学期12月摸底考试数学(文)试题(已下线)模块三 专题3 小题满分挑战练(3)(人教B)
23-24高三上·全国·阶段练习
名校
解题方法
3 . 如图,已知正方体
的棱长为2,E,F分别为AB,BC的中点,则下列说法正确的是________ .(填写所有正确说法的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/5eb42652-409e-4ff4-ba70-783d263418aa.png?resizew=180)
①平面
截正方体
所得截面图形的周长为
;
②点B到平面
的距离为
;
③平面
将正方体
分割成两部分,较小一部分的体积为
;
④三棱锥
的外接球的表面积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/5eb42652-409e-4ff4-ba70-783d263418aa.png?resizew=180)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab44d33142e571bf155f367a0224a422.png)
②点B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e23ab2a5db0d58b522f1e2699bfe60.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9717d0d1aa041214f440e171b54465.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2517c94dd8e4bd6e1c19778905f7640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375025f01ec49e6d50e45cce5fee8d88.png)
您最近一年使用:0次
名校
4 . 下列说法正确的是___________ (填写序号)
①命题“若
,则
”的逆否命题是“若
,则
”;
②“
”是“
”的充分不必要条件;
③若
为假命题,则
均为假命题;
④命题
,使得
,则
,均有
.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e38581b43f437454b86dae0daed9a2f.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
④命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fac11dd95cb4b78adb817fad02dedb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cd44731d509352f907c9773a42cab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c77d129b56255baf3d76eb2a6c2ff.png)
您最近一年使用:0次
2021-10-10更新
|
682次组卷
|
3卷引用:宁夏平罗中学2022届高三上学期第一次月考数学(文)试题
名校
5 . 关于函数
有下列命题:
①其表达式可写成
;
②直线
是
图象的一条对称轴;
③
的图象可由
的图象向右平移
个单位长度得到;
④存在
,使
恒成立.
其中正确的是__________ (填写正确的番号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1aa03170ed9bb49f3a135e431d1ea2.png)
①其表达式可写成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a49eac607ec41921e35fbd69d16703.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feed53a8c562448cdf8ab1534cc4c8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bc6775d59e23a45d1c4357d5ffe228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
④存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281805b9dfe2162215dfe6b5ad6d7b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35fa3f008a8befb353990564f83edd72.png)
其中正确的是
您最近一年使用:0次
2021-11-20更新
|
448次组卷
|
5卷引用:宁夏石嘴山市平罗中学2022届高三上学期第三次月考数学(理)试题
宁夏石嘴山市平罗中学2022届高三上学期第三次月考数学(理)试题四川省广安市广安代市中学校2021-2022学年高一上学期11月月考数学试题(已下线)5.6 函数y=Asin(ωx+φ)-2021-2022学年高一数学考点讲解练(人教A版2019必修第一册)(已下线)2020年高考江苏数学高考真题变式题6-10题(已下线)专题06 函数y=Asin(ωx+φ)-2021-2022学年高一《新题速递·数学》(人教A版2019)
名校
解题方法
6 . 将
个数排成
行
列的一个数阵,如下图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b42a6527d536851721e2d6d1779f40.png)
该数阵第一列的
个数从上到下构成以
为公差的等差数列,每一行的
个数从左到右构成以
为公比的等比数列(其中
).已知
,
,记这
个数的和为
.给出下列结论:①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ee24cb4787a625ef896018298b3a22.png)
其中结论正确的是______ .(填写所有正确答案的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceef1abeeef220b4fe5f7d96feedd90.png)
![](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/e6b42a6527d536851721e2d6d1779f40.png)
该数阵第一列的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c20bc8da04fbb4bfea4e412274dde2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b73ec6f2aef5440b1b689fe74a8da96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceef1abeeef220b4fe5f7d96feedd90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9f9fa5a74a471d784caf42fa662a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0367f5f840bf6ad1c1dc94049a326e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ee24cb4787a625ef896018298b3a22.png)
其中结论正确的是
您最近一年使用:0次
名校
解题方法
7 . 下列说法:
①若
,则a的取值范围是
;
②若关于x方程
有两个不等实根,则k的取值范围是
;
③若x,y满足约束条件
,则
的取值范围为
;
④已知点
是圆
上的点,则
的取值范围是
;
⑤圆
上有4个点到直线
的距离为
.
其中正确的是______ .(只填写相应的序号 )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa5b4a297839180fc3326eed4351bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b39f15729c7b85f666ce498fcd6203.png)
②若关于x方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66acde2de7a6b791b66c7d6264d9691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a2c9b2a4f6bb96f99461130f78c481.png)
③若x,y满足约束条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a80d0871ab9d635e5cf36f4d0f3b7eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9f4c6be70f463b4422fedd4c981d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76156a5abf37c361f9287c0c4dc8396.png)
④已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ab11ba6b230c4309e1b899eb58daae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b4814dceed7290bc3049b2620ccfc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2eedab1868828530de228aee6a714a.png)
⑤圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730c71a1c8ccd9bd19ea075d6f38adb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac74fcec33998e08b909a3e52508791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
其中正确的是
您最近一年使用:0次
名校
8 . 下列命题正确的是________ .(填写正确的序号)
①在等差数列
中,有
,则
;
②已知数列
是正项等比数列,且
,则
的值可能是
;
③已知函数
是定义在R上的奇函数,且对任意
,都有
成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b6ed8cbd4162259985201ddfa4a049.png)
.
①在等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788beef99e78bcb25b193a0e50362d9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c634e9a8afd9e6c931307dfaabb06810.png)
②已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3469ea4b3664ef316692458c96ac68d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
③已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e04b4cd16224102ef696222caa56ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b6ed8cbd4162259985201ddfa4a049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afcc9c8a1885dad421eb332afc8c6039.png)
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2020-11-20更新
|
194次组卷
|
2卷引用:宁夏六盘山高级中学2021届高三上学期第二次月考数学(文)试题
名校
9 .
的展开式中
的系数为________ .(用数字填写答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986daf391d5a01b5744efb6fc4e89f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae666ea089aeed6e8df798c81dd2f187.png)
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2020-06-29更新
|
233次组卷
|
14卷引用:宁夏吴忠市吴忠中学2019届高三下学期第一次模拟考试数学(理)试题
宁夏吴忠市吴忠中学2019届高三下学期第一次模拟考试数学(理)试题【全国百强校】四川省棠湖中学2017-2018学年高二零诊模拟数学(理)试题【全国百强校】黑龙江省牡丹江市第一高级中学2018-2019学年高二下学期期中考试数学(理)试题(已下线)2019年6月16日 《每日一题》理数选修(下学期期末复习)每周一测【市级联考】广东省肇庆市2019届高中毕业班第三次统一检测数学(理)试题(已下线)专题11.3 二项式定理(讲)【理】-《2020年高考一轮复习讲练测》2019届重庆市南开中学高考模拟(7)理科数学试题吉林省长春外国语学校2019-2020学年高二上学期期末数学(理)试题重庆市南开中学2019-2020学年高三下学期3月月考数学(理)试题四川省南充高级中学2019-2020学年高三下学期第三次线上月考数学(理)试题2020届内蒙古呼伦贝尔市海拉尔区高三第一次统考理科数学试题四川省泸州市泸县第二中学2020届高三下学期第四次学月考试数学(理)试题四川省宜宾市第四中学校2020届高三第一次高考适应性考试数学(理)试题福建省泉州市永春一中2019届高三高考数学(理)前适应性试题
名校
10 . 已知下列四个命题:
(1)等差数列一定是单调数列
(2)等差数列的前
项和构成的数列一定不是单调数列
(3)已知等比数列
的公比为
,若
,则数列
是单调递增数列
(4)记等差数列的前
项和为
,若
,则数列
的最大值一定在
处取到.
其中错误的有________ (填写所有错误的命题的序号)
(1)等差数列一定是单调数列
(2)等差数列的前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(4)记等差数列的前
![](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/d5ac2a8583a6c5eed071c005d41a6b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef7ca2b3e8061384501f668e59696a1.png)
其中错误的有
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