1 . 若
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6bccefba2730403aebdf1f3d8e8a20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6abc69c57972a4efb8301e3308ea9ca6.png)
A.0 | B.1 | C.![]() | D.![]() |
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解题方法
2 . 化简:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5f62adadefc34beded6e799e75ba54.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5f62adadefc34beded6e799e75ba54.png)
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3 . 化简:(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573bc26f82745fde822dc416bb7f8ccf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cade3a580ad7616e00b0b06e1b51c576.png)
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解题方法
4 . 方程
在
上的解集是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c356ef083cb171350060a272327c13b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfe8e7fb253685e0e50bae0c5482314.png)
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20-21高一·上海·假期作业
解题方法
5 . 给出四个命题:
①若
,则△ABC一定是锐角三角形;
②若
,则△ABC一定是钝角三角形;
③若
,则△ABC一定是钝角三角形;
④若
,则△ABC一定是直角三角形.
其中正确的命题有( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb8ba8c77db65cbcd95941c4088789e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1116215e558396687e4ca6fc8bbabf.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5132c9fd99b1823191f2714530be4ec4.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80edd479b2d1a1f2cb1d75a52b674c8.png)
其中正确的命题有( )
A.3个 | B.2个 | C.1个 | D.0个 |
您最近一年使用:0次
20-21高一·上海·假期作业
真题
6 . 已知
且
都是锐角,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b27f17018cb794842e497219113b80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c221902e3f091b198a2c01628b62b055.png)
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20-21高一·上海·假期作业
7 . 化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e14d24d9695aea9d141b4899b5eb0be.png)
_____ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b340d962ee6fe2c1cdb28c83667a4818.png)
_______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1792f9c3dc8e149e77fb61bf0fa5ea51.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e14d24d9695aea9d141b4899b5eb0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b340d962ee6fe2c1cdb28c83667a4818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1792f9c3dc8e149e77fb61bf0fa5ea51.png)
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20-21高一·上海·假期作业
8 . 求值:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042b119c698222225ef2c4fcd5a20604.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042b119c698222225ef2c4fcd5a20604.png)
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20-21高一·上海·假期作业
解题方法
9 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1926333cc8394966b0af38691850bf6.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053ba5ff200013fd3289af4603c45aa8.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1926333cc8394966b0af38691850bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053ba5ff200013fd3289af4603c45aa8.png)
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2021高一·上海·专题练习
解题方法
10 . 在
中,已知
,试判断
的形状
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758794bef4c96487999ba773333449e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次