求下列各式的值:
(1)
.
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b8aae328e120affbb55bec02e80ee2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d5d70f243431f457352d42c9dd6c38.png)
更新时间:2021-12-14 22:09:40
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解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐1】已知数列
满足:
,
.
(1)若
是常数列,求
;
(2)已知
.
(i)证明:
是等比数列;
(ii)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0daac97fcdc163e0e2a11aa22d9062d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77eb4367983d955a4f070045d1290c9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(i)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e987756fedea2408cd8c8a0672c3f50.png)
(ii)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f4806c33037cdefea6336f505a4ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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解答题-问答题
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较易
(0.85)
名校
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【推荐1】(1)计算:
;
(2)已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194e621ce57c596d569003d78b2aba7c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13a60eae5418b79bc808b775a396c16.png)
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【推荐2】求下列各三角函数值:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9660a659d247c7632024ebb7bbc4.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e3279477629f9b101c82ab077c3bbc.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fe52ec8bef05697ba0caaf4ee2515f.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787d60791f918bae844eb14c9ca2120d.png)
您最近一年使用:0次