12-13高三上·北京丰台·单元测试
解题方法
1 . 如图,在三棱柱ABC-A1B1C1中, CC1⊥底面ABC,AC=BC,M,N分别是CC1,AB的中点.
![](https://img.xkw.com/dksih/QBM/2013/5/21/1571222160670720/1571222166233088/STEM/2677c512b8024e7ba74586a24018b31b.png)
(1)求证:CN⊥AB1;
(2)求证:CN//平面AB1M.
![](https://img.xkw.com/dksih/QBM/2013/5/21/1571222160670720/1571222166233088/STEM/2677c512b8024e7ba74586a24018b31b.png)
(1)求证:CN⊥AB1;
(2)求证:CN//平面AB1M.
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