名校
解题方法
1 . 已知正项数列
的前
项和为
,且
,
.
(1)求数列
的通项公式
;
(2)若
,求数列
的前
项和
.
![](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/e27254e4690ebd4a0798a5dd26fac397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6933c0370a0ee2c2d05eba23027281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2 . 在
中,角
所对的边分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c8443ebaf4fbd0e13e59ed0520fcc8.png)
(1)若
,点
在边
上,
,求
的外接圆的面积;
(2)若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c8443ebaf4fbd0e13e59ed0520fcc8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee01ac94bc29e98590b83233a09f5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3165e97ffc02c3d21a79f4e9f34ff368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2021-05-27更新
|
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6卷引用:河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题
河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题山东省青岛市2021届高三三模数学试题(已下线)考前题型猜猜猜(终极预测)-2021年高考数学解答题挑战满分专项训练(新高考地区专用)(已下线)第31讲 正弦定理、余弦定理-备战2023年高考数学一轮复习考点帮(新高考专用)安徽省合肥市肥东县综合高中2022-2023学年高三上学期10月月考数学试题(已下线)拓展三:三角形面积(定值,最值,范围)问题(精讲)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)
3 . 已知数列
满足
,
,
.
(1)求证:数列
是等比数列;
(2)求数列___________的前
项和
.
从条件①
,②
,③
中任选一个,补充到上面的问题中,并给出解答.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7723a4aae09788bca23cbc9f5b0ec6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c286f0bf939f0ec7abed0d75f414c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128d43fbfe37d2334f8666239efc7e32.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列___________的前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
从条件①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252c11358caee9b67dcf43ef17c01f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303d10573dc9ca05c9282fe0d6ffee2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ad9df86906d55173c669003b1216f1.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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2021-05-23更新
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河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题(已下线)普通高等学校招生全国统一考试 数学押题卷(六)新高考2021届高三考前保温热身模拟卷数学试题(四)(已下线)考前题型猜猜猜(终极预测)-2021年高考数学解答题挑战满分专项训练(新高考地区专用)辽宁省凤城市第一中学2021-2022学年高三上学期10月月考数学试题
2021·全国·模拟预测
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解题方法
4 . 已知
为等差数列
的前
项和,且
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/abb435a799502f301a5fc66ae6536356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3fb0eaaf10efe91aec427971e34ee2.png)
A.![]() | B.![]() |
C.![]() | D.满足![]() ![]() |
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2021-05-19更新
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河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题(已下线)2021新高考高考最后一卷数学第八模拟(已下线)专题7.3 等差数列的前n项和-2022届高三数学一轮复习精讲精练(已下线)考前题型猜猜猜(终极预测)-2021年高考数学解答题挑战满分专项训练(新高考地区专用)(已下线)4.2.3 等差数列的前n项和(2)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)(已下线)热点03 等差数列与等比数列-2022年高考数学【热点·重点·难点】专练(全国通用)(已下线)专题07 等差数列与等比数列-2022年高考数学毕业班二轮热点题型归纳与变式演练(新高考专用)(已下线)专题29 等差数列通项与前n项和
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5 . 已知
是圆
上的点,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827539d066d1b78e7ef8bc1569864971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() |
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|
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6卷引用:河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题
河北省秦皇岛市青龙满族自治县第一中学2021届高三适应性考试数学试题四川省达州市2021 届高三二模数学(文)试题四川省达州市2021 届高三二模数学(理)试题(已下线)专题2.2 基本不等式及其应用(练)- 2022年高考数学一轮复习讲练测(新教材新高考)(已下线)考前题型猜猜猜(终极预测)-2021年高考数学解答题挑战满分专项训练(新高考地区专用)(已下线)考向22不等式性质与基本不等式(重点) - 2
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6 . 如图,A,B两点在河的同侧,且A,B两点均不可到达,要测出AB的距离,测量者可以在河岸边选定两点C,D,若测得
,则下列计算结果正确的有( )
![](https://img.xkw.com/dksih/QBM/2021/3/28/2687852724445184/2688904438161408/STEM/5132b974-e163-4cc4-9f6d-0317088e3d93.png?resizew=259)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbaa8555589749bc8a31512c689e9d8.png)
![](https://img.xkw.com/dksih/QBM/2021/3/28/2687852724445184/2688904438161408/STEM/5132b974-e163-4cc4-9f6d-0317088e3d93.png?resizew=259)
A.![]() | B.![]() |
C.![]() | D.![]() |
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|
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7 . 已知等差数列
的前n项和为
,公差为3,若
,
,
成等比数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.25 | B.30 | C.35 | D.40 |
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|
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8 . 等差数列
的前
项和分别为
,若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942ed174dfdafaf5f0a68cac579110f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926a463417a61564d4290a78782d83be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ec6397358a3548a347738e124a2176.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-11-22更新
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名校
解题方法
9 . 已知等差数列
中,公差
,
,且
是
与
的等比中项.
(1)求数列
的通项公式;
(2)令
,记数列
的前
项和为
,求使得
恒成立的实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56e10e6afc8e6a051babf2a4a287ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36eb12d2a1ae9362708529406d7ae03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
10 .
的内角
,
,
所对边分别为
,
,
,已知
.
(1)求
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a480cd8d6573be512bc4a0033048a9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf4c55e68427cca325cfbddedcf84eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1892446e9f5c057a6d72a64065d01ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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