1 . 给出下列命题:
①存在实数
使
;
②直线
是函数
图象的一条对称轴;
③
的值域是
;
④若
,
都是第一象限角,且
,则
.
其中正确命题为______ .
(把所有正确命题的序号都填写在横线上).
①存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb1a2bf4d03dc14c244c4f53aec1d1f.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b568758b3b44af0cbfe06f25d2fe8952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c65d71e57e6e7697e2f627dcd58583.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018c064340a9b2241e3b0fe6188e6afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce922ff211bd2f0a423e552b1011ec5.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/116a4f1c8b51d1993e6d7c054e2ed5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f968380bd05be0a88c4c389b344050c.png)
其中正确命题为
(把所有正确命题的序号都填写在横线上).
您最近一年使用:0次
2 . 下列公式中,对于任意
恒成立的是_____________________ (请填写相应序号).
①
;
②
;
③
;
④
;
⑤
;
⑥
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb66f4db41478c23128adc14f2796556.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10627c960450259200ebff3452274532.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0c9a8ac55e31bf5e90ce22c6e6108f.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9728cefd536ca82f8b2f34aa0733b5d5.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008c044f8b1b4f7df0da3a409e80c55d.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deeefde15ee409fa570882abccd9b475.png)
⑥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1ec2d7289bc848c59d03ef876073d6.png)
您最近一年使用:0次
解题方法
3 . 有下列命题
①已知
,
都是第一象限角,若
,则
;
②已知
,
是钝角
中的两个锐角,则
;
③若
,
,
是相互不共线的平面向量,则
与
垂直;
④若
,
是平面向量的一组基底,则
,可作为平面向量的另一组基底.
其中正确的命题是__________ (填写所有正确命题的编号).
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90df641ab645927ee577e79faf18dcdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890105f677da9bf3d5483f5344065b35.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616c1a8ad330bf7a731a41596f77e3c5.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad148ee6fb234f2d631b8cc514ed19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7b617fd264acf4d9413c9de1271a0e.png)
其中正确的命题是
您最近一年使用:0次