已知数列
为等差数列,且满足
.若
展开式中
项的系数等于数列
的第三项,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80150501ffaafa3c78e13cc663de399f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4328506d29133a95d132a9d12a06babf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.6 | B.8 | C.9 | D.10 |
更新时间:2017-04-02 20:57:59
|
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【推荐1】等差数列
的前
项和为
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( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd9aa5ea928f401f91440cfa7870c83.png)
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A.42 | B.56 | C.63 | D.70 |
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单选题
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较易
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【推荐2】在等差数列
中,若
为方程
的两根,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2091731bd79844f0f254fe1812aa6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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A.10 | B.20 | C.15 | D.40 |
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单选题
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名校
解题方法
【推荐1】已知
,则“
”是“
的二项展开式中常数项为60”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
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A.充要条件 | B.充分不必要条件 |
C.必要不充分条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
单选题
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较易
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解题方法
【推荐2】若
的展开式中含
项的系数为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2c2fac475aee8462006f545e51e281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次