2021高二·全国·专题练习
1 . 判断下列命题的真假.
①空间向量就是空间中的一条有向线段;( )
②不相等的两个空间向量的模必不相等;( )
③任一向量与它的相反向量不相等;( )
④向量
与向量
的长度相等.( )
①空间向量就是空间中的一条有向线段;
②不相等的两个空间向量的模必不相等;
③任一向量与它的相反向量不相等;
④向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ba913238f9aaa01696586b618ac20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
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2021高一下·全国·专题练习
2 . 判断下列命题是否正确,并说明理由.
①若
,则
一定不与
共线;( )
②若
,则A,B,C,D四点是平行四边形的四个顶点;( )
③在平行四边形ABCD中,一定有
;( )
④若向量
与任一向量
平行,则
=
;( )
⑤若
=
,
=
,则
=
;( )
⑥若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
.( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6118886003b5867c2ad0afbfd77345b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ccecb2c6965297b0357d42e53503bf.png)
③在平行四边形ABCD中,一定有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ccecb2c6965297b0357d42e53503bf.png)
④若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8056472fd8642b035496fdd6f30454e4.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a87c03982d3af82c243fe0cca504f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a87c03982d3af82c243fe0cca504f1.png)
⑥若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a87c03982d3af82c243fe0cca504f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a87c03982d3af82c243fe0cca504f1.png)
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2021高二·全国·专题练习
解题方法
3 . 过点A(4,1)且在两坐标轴上的截距相等的直线方程为x﹣4y=0或x+y﹣5=0.( )
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4 . 如果数列{an}为等比数列,则数列{ln an}是等差数列.( )
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5 . 三个数a,b,c成等比数列的充要条件是
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
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6 . 如果数列{an}为等比数列,
,则数列{bn}也是等比数列.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25b075f3002d83c9bedb113dc04b4f1.png)
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7 . 满足an+1=qan(n∈N*,q为常数)的数列{an}为等比数列.( )
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2021高二·全国·专题练习
8 . 已知等差数列{an}的通项公式an=3-2n,则它的公差为-2.( )
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2021高二·全国·专题练习
9 . 等差数列的前n项和公式是常数项为0的二次函数.( )
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