2019高三·浙江·专题练习
1 . 设
是两个非零平面向量,则有:
①若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048e833e0c0995d4cf039ed30ba38b56.png)
②若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe6e32c99da18296d5e13f4547e9834.png)
③若
,则存在实数
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2ace72833d193f011dfb52d94a0c98.png)
④若存在实数
,使得
,则
或
四个命题中真命题的序号为 __________ .(填写所有真命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15bd315b801f71bc30b8d772098614.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8e72311ca34443d0dc1d21627fb20d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048e833e0c0995d4cf039ed30ba38b56.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048e833e0c0995d4cf039ed30ba38b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe6e32c99da18296d5e13f4547e9834.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe6e32c99da18296d5e13f4547e9834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2ace72833d193f011dfb52d94a0c98.png)
④若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2ace72833d193f011dfb52d94a0c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56661d8812bc162d6d5b825fc328bc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf010ec23c886c9fbe5b69e3eb98d13.png)
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2 . 已知方程
表示的曲线为
的图象,对于函数
有如下结论:①
在
上单调递减;②函数
至少存在一个零点;③
的最大值为
;④若函数
和
图象关于原点对称,则
由方程
所确定;则正确命题序号为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663e44da386d2ec788ab2843a0fa6081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28260530b69b5cf616608d9d2a2d3951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cb57eaef0982874cbf9d87bfaea05d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae20e2bfcc752c07a7ce6614b0b1a03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246571c22e1aec67fdc7fc12e21c3113.png)
A.①③ | B.②③ | C.①④ | D.②④ |
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