20-21高二·全国·课后作业
1 . 如果
是等比数列,而且正整数s,t,p,q满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4eb8cb5aa60502cee5eefdb8ed3fa69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d858403df7f79be282040346e4b1060c.png)
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20-21高一·全国·课后作业
2 . 在
中,斜边c等于
外接圆的直径2R,故有
,这一关系对任意三角形也成立吗(如图)?探索并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30b12f8bf54428846cf378ffd5a23b7.png)
![](https://img.xkw.com/dksih/QBM/2021/11/11/2849051998388224/2849773829832704/STEM/9fe85621-a425-48b5-b514-51d363e38aa8.png?resizew=355)
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20-21高一·江苏·课后作业
名校
解题方法
3 . 已知a,b,c,d都是正数,且
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf7adcc976209d4b686156120bea276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272f8da86f3473b8448d0a51cae4dea9.png)
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2021-10-31更新
|
294次组卷
|
3卷引用:苏教版(2019)必修第一册课本习题 习题3.2
20-21高二·全国·课后作业
解题方法
4 . 设
是等比数列,且
,证明数列
是等差数列,并求出这个等差数列的首项与公差.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4711944aa361bd9f2ed566b24c6888ec.png)
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20-21高一·江苏·课后作业
5 . 证明下面的结论:
(1)如果
,
,且
,那么
;
(2)如果
,
,那么
;
(3)如果
,
,那么
;
(4)如果
,
,
,那么
.
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cbc322861846709c08c7f1da746848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f50ce6b511e6b928796e048fc7fa5c.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca24341509c05e672999202f2df0ebaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e271b6e63206285461a7552d11efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f50ce6b511e6b928796e048fc7fa5c.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d89ab55ffb93cc48f077b542dbd25aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f39f99ebfadbe8d8b7dd2b08476a25.png)
(4)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d89ab55ffb93cc48f077b542dbd25aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f93dcad997a94b38329bd3cfb48962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b401efefaa63cfdb2129fbe399e0a8f.png)
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20-21高一·全国·课后作业
6 . 用余弦定理证明:平行四边形两条对角线平方的和等于四条边平方的和.
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20-21高一·全国·课后作业
解题方法
7 . 用余弦定理证明:在△
中.
(1)
;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63471f592531e46277365ed319e2acc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17f388fec2cc99288248801962c266b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ce2f54d69a5987c1de19da53342811.png)
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20-21高二·全国·课后作业
解题方法
8 . 如果
,试写出数列
的前3项,并猜想出它的一个通项公式,然后给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29f886b6808a3f15c136c5377e12326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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20-21高一·江苏·课后作业
解题方法
9 . 已知
g糖水中含有
g糖(
),若再添加
g糖(
)溶解在其中,则糖水变得更甜(即糖水中含糖浓度变大).试根据这个事实写出a,b,m所满足的不等关系,并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
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20-21高一·全国·课后作业
10 . 在
中,
的外角平分线交BC的延长线于D,用正弦定理证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5ca418ff0d36929cd06551f74d58c2.png)
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