1 . a,b,c为实数,在等式中,若
,则
;在不等式中,若
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c2c12e403e4dab34c0590455dc0ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13c960fa57440fcabc5b2cc086ccc64.png)
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2 . 能被5整除的整数末位数字为0是存在量词命题.( )
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3 . 命题:①若
,则
;②若
,则
;③若
,则
;中正确的命题是②③.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98fb7a22350d03bd418beb1744dbfc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
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4 .
,使
是存在量词命题,且是真命题.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8646eaa05bfde39d27813c301a076420.png)
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5 . 集合
中有2个元素.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9a5759ced8d14b3a9f0e7608c6c137.png)
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6 . 自然数集
中最小的元素是0.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad135b14c9dcd83eab6618d7694c7b0.png)
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7 .
是空集.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f5e5688b5c7e514ee72597690a7676.png)
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8 . 某班级年纪较大的任课教师可以构成一个集合.( )
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9 . 方程
的解集为
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5487f5c35a90859144bfe00227499b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd34a7b14c59a9662fba52f27f99e1e5.png)
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10 . (1)若
与
都是单位向量,则
.( )
(2)平面内的任意两个向量都可以作为一组基底.( )
(3)平行向量的方向一定相同.( )
(4)若
,则
或
.( )
(5)若
的面积
,则
或
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778542d99ab19e2ecc0c7ef75161f133.png)
(2)平面内的任意两个向量都可以作为一组基底.
(3)平行向量的方向一定相同.
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cc1f1ef9ad32eef62aefa4c3fc3d6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d065bd10f7ea1f05764e28f095f244f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aed3d85ea66827c00b5f7e4c5ae598a.png)
(5)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72d02ca51ae5759ee8e5ca23d3ff0e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6794a460487525552efedd7edc4df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4c5016bd1fc6582078299b9cf8b392.png)
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