1 . 求
等的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba10d7f170f8a26c3367a57e1d5f6b7.png)
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2 . 求值:(1)
=__________________ ;
(2)
=__________________ ;
(3)
=__________________ ;
(4)
=__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84b3c52523b40880a7ba0ca30cc2df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776f49f6026bfc192b9b30504583cab3.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b37154820afbaea6185a37f7d600ba6.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d091361baecf9938d18949480a090d8c.png)
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3 . 在
中,已知
,那么一定有( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 如图,在△ABC中,0为边BC的中点,点M、N分别在边AB、AC上,且AM=6,MB =4,AN=4,NC=3,∠MON=
,求∠A的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/eb0e46b5-c958-440e-847a-46f820544a95.png?resizew=130)
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2018-12-16更新
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141次组卷
|
2卷引用:2011年新知杯上海市高中数学竞赛试题