名校
解题方法
1 . 当
时,将三项式
展开,可得到如图所示的三项展开式和“广义杨辉三角形”:
的展开式中,
的系数为
,则实数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a40142c84be68ee2918c3a8303388c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bb2642cc64be072c6236b4de9564d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21357a1cce933c897d957a44e22b4b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be56e9bad873ec62fa3319414edcdfd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86608326541db75771f5de9db6187e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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