1 . 下列命题正确的是( )
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
2 . 求值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ecb8478a4c3849a72dc7f10d457cfd.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ecb8478a4c3849a72dc7f10d457cfd.png)
您最近一年使用:0次
3 . 设数列
均为等差数列,且公差均不为0,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5588a0c1e3771a661c37d42208e7409.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942ed174dfdafaf5f0a68cac579110f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011432d93e2b3a978e2dd2ebb39f3d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5588a0c1e3771a661c37d42208e7409.png)
您最近一年使用:0次
2020-01-11更新
|
107次组卷
|
3卷引用:上海市市北中学2017-2018学年高二上学期期中数学试题