给出下列四个命题:
①半径为2,圆心角的弧度数为
的扇形面积为![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/8cec4de4fe2b4b5d9f431510dca25087.png?resizew=12)
②若
为锐角,
,则![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/279194265042495f9978a8d2d4188d8b.png?resizew=118)
③函数
的一条对称轴是![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/084d70afa18648c0bf9da4b42c0d3f86.png?resizew=49)
④已知
,
,则![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/8e9a09c7cfc14bb38af005ee6276d4eb.png?resizew=120)
其中正确的命题是______________ .
①半径为2,圆心角的弧度数为
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/8cec4de4fe2b4b5d9f431510dca25087.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/8cec4de4fe2b4b5d9f431510dca25087.png?resizew=12)
②若
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/c63022eae3e849aa9928d2b0f3742cec.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/ecfa57fd06054fc78e6259eb520a8dc7.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/279194265042495f9978a8d2d4188d8b.png?resizew=118)
③函数
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/373bf91b57a0437ab8cdaa9d909d954c.png?resizew=106)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/084d70afa18648c0bf9da4b42c0d3f86.png?resizew=49)
④已知
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/3747f95fc7fc4c28b4b3dde302559200.png?resizew=74)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/57935b5019ff4011b41746d4a8f97c25.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572380069625856/1572380075384832/STEM/8e9a09c7cfc14bb38af005ee6276d4eb.png?resizew=120)
其中正确的命题是
更新时间:2016-12-03 19:39:53
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【推荐1】下列命题:
①“a>b”是“a2>b2”的必要条件;
②“|a|>|b|”是“a2>b2”的充要条件;
③“a>b”是“a+c>b+c”的充要条件.
其中是真命题的是________ (填序号).
①“a>b”是“a2>b2”的必要条件;
②“|a|>|b|”是“a2>b2”的充要条件;
③“a>b”是“a+c>b+c”的充要条件.
其中是真命题的是
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【推荐2】若存在
,使得
对任意
恒成立,则函数
在
上有下界,其中
为函数
的一个下界;若存在
,使得
对任意
恒成立,则函数
在
上有上界,其中
为函数
的一个上界.如果一个函数既有上界又有下界,那么称该函数有界.下列四个结论:
①1不是函数
的一个下界;②函数
有下界,无上界;
③函数
有上界,无下界;④函数
有界.
其中所有正确结论的编号为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db64b3a1fb036b1e15ecc1420f008013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0aa28b363cb79e6f8988b9b2bad7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
①1不是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b0094847f83030c5db54d40810ae4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7ed99a74e126a05cb520f19c094020.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04cd69f4ac6b792108019de2806ceea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea9d855bb5c117c9ec7117eeda6cded.png)
其中所有正确结论的编号为
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【推荐1】已知函数
,有以下结论:
①
的图象关于y轴对称; ②
在区间
上单调递增;
③
图象的一条对称轴方程是
; ④
的最大值为2.
则上述说法中正确的是__________ (填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d24a993960f830bce5a9540141e662.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e4b97703638756a4051a3dd0cdcf5a6.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6461468072bd27afd53fd5f9c3bf344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
则上述说法中正确的是
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【推荐2】将函数的图象
向左平移
个单位后,得到函数
的图象,则
的图象关于点__________ 对称(填坐标)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e960ab40ee6533d55c4eb3303bb4c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
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【推荐1】已知a,b,c分别为
三个内角A,B,C的对边,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b11d83cc4abd3886788064b177a46c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
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【推荐2】在
中,内角
,
,
所对的边分别为
,
,
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c885e8032706feed854495e0f608aa04.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e4758ddc08963fc2bef9f218fabac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c885e8032706feed854495e0f608aa04.png)
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