指出下列各题中p是q的什么条件.
(1)p:x-3=0,q:(x-2)(x-3)=0.
(2)p:两个三角形相似,q:两个三角形全等.
(3)p:a>b,q:ac>bc.
(1)p:x-3=0,q:(x-2)(x-3)=0.
(2)p:两个三角形相似,q:两个三角形全等.
(3)p:a>b,q:ac>bc.
2020高一·全国·专题练习 查看更多[3]
专题02 充分条件、必要条件、全称量词、存在量词(知识精讲)-【新教材精创】2019-2020高一数学新教材知识讲学(人教A版必修第一册)-《高中新教材知识讲学》(已下线)第一章 集合与逻辑(知识清单+典型例题)-【满分全攻略】(沪教版2020必修第一册)(已下线)第一章 集合与常用逻辑用语(知识清单+典型例题)-【满分全攻略】(人教A版2019必修第一册)
更新时间:2020-04-11 14:28:36
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解题方法
【推荐1】已知
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(1)比较
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(2)试问“
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(1)比较
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(2)试问“
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【推荐2】已知
,向量
,向量
,集合
.
(1)判断“
”是“
”的什么条件;
(2)设命题
若
,则
.命题
若集合
的子集个数为2,则
.判断
,
,
的真假,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
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(1)判断“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
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(2)设命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057cdb4057bca398a838e868efd360f5.png)
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【推荐2】下列“若p,则q”形式的命题中,哪些命题中p是q的充分条件?哪些命题中p是q的必要条件?
(1)若x>2,则|x|>1;
(2)若x<3,则x2<4;
(3)若x=1,则x-1=
;
(4)若两个三角形的周长相等,则这两个三角形的面积相等.
(1)若x>2,则|x|>1;
(2)若x<3,则x2<4;
(3)若x=1,则x-1=
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(4)若两个三角形的周长相等,则这两个三角形的面积相等.
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名校
【推荐1】判断下列p是q的什么条件(充分不必要条件,必要不充分条件,既不充分也不必要条件,充分必要条件).
(1)
:
是无理数;
:
是有理数.
(2)
:
;
:
.
(3)
:
;
:点
在第一象限.
(4)
:集合
有两个子集;
:
或
.
(1)
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(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c328c9c4ec69c4275e27576fb61655.png)
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(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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【推荐2】下列“若p,则q”形式的命题中,哪些命题中p是q的充分条件?哪些命题中p是q的必要条件?
(1)若x>2,则|x|>1;
(2)若x<3,则x2<4;
(3)若x=1,则x-1=
;
(4)若两个三角形的周长相等,则这两个三角形的面积相等.
(1)若x>2,则|x|>1;
(2)若x<3,则x2<4;
(3)若x=1,则x-1=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67156a68e3937a0114be1b502e0ab5ae.png)
(4)若两个三角形的周长相等,则这两个三角形的面积相等.
您最近一年使用:0次