1 . 已知函数
和
,有下列四个结论:
①当
时,若函数
有3个零点,则
;
②当
时,函数
有6个零点;
③当
时,函数
的所有零点之和为
;
④当
时,函数
有3个零点;
其中正确结论的序号为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9840391d419be2c41486d68765a8d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6c6239394a7a9f13584e954f0dbded.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc046a7b475b5130da69bf537226ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9977b59a789b7cfdd49185deb2b1b0d7.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3adb9acead48e36b705874dc96979f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a876d70607e661282d61705b36ae40df.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfc6f997f5465c88d68dde7fd874fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276b142a9d9f0a87425a668dd6501f15.png)
其中正确结论的序号为
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13-14高一上·甘肃兰州·期末
2 . 下面四个命题中,其中正确命题的序号为____________ .
① 函数
是周期为
的偶函数;
② 若
是第一象限的角,且
,则
;
③
是函数
的一条对称轴方程;
④ 在
内方程
有3个解.
① 函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2baeff76035838a627d95b6165e655d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
② 若
![](https://img.xkw.com/dksih/QBM/2013/6/28/1571257917243392/1571257922461696/STEM/0e0e80b8eb954539b873a0b916736934.png?resizew=42)
![](https://img.xkw.com/dksih/QBM/2013/6/28/1571257917243392/1571257922461696/STEM/c66384ca46a942e9a6e426dfd2ed3f24.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2013/6/28/1571257917243392/1571257922461696/STEM/3f7f4e077c24470b9d4073983bc1ac91.png?resizew=85)
③
![](https://img.xkw.com/dksih/QBM/2013/6/28/1571257917243392/1571257922461696/STEM/bb338ce9b9934817bf7324b5645f1dd9.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2013/6/28/1571257917243392/1571257922461696/STEM/3c09814775114293897ce2f2451d2b71.png?resizew=116)
④ 在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbd3d34a506c95d0b9811ad01348cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b444aca8c3f352da41028849a17b692.png)
您最近一年使用:0次