1 . 下列命题是真命题的序号是______ .①若
,则
;②若
,则
;③若
,则
;④若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d43b4c79f79428f2d1ae908f7039017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a7e4dcebd24c843379926de9c0b780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59efa7c1639b74556f993f0a3c6e979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb69dcd17cd8448b0ed90fc02a7f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea291e25a168aca912fd61036fc4145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea291e25a168aca912fd61036fc4145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a7e4dcebd24c843379926de9c0b780.png)
您最近一年使用:0次
2 . 下列命题是真命题的序号是______ .
(1)若
则
(2)
(3)
是对数函数
(4)
是幂函数
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1300c23cc3dd6491fe73eb4753cd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc3e5be1796493161a4df7e28a6f6b7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63af71b9e6f71cd26e6e97541154cd8c.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c11bc70ddf54136c9e381209d46957f.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c904567c3b3734e1eca8d042ef7a7b2d.png)
您最近一年使用:0次
3 . 下列四个结论中正确的个数是______
“
”是“
”的充分不必要条件;
命题:“
”的否定是“
”;
“若
,则
”的逆命题为真命题;
若
是
上的奇函数,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf1693d7d386d92a5ab540f194251cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc810219a7939cee63c092914567ce14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23eefdd44e679b004f2c978e87208e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8927da130e0123a545ddd440a5e50106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda8565a1d4a913f01345aa82478bf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92d4bc5ce10f347410983d542f1668b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6461468072bd27afd53fd5f9c3bf344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a46a6558b79c126968068088a48b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a35419c4adf94e417c8bbd163599cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da3a6d011679952771607b3a166676b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a1aa0c685c29aedbca195e0936368f.png)
您最近一年使用:0次
4 . 已知下列四个命题:
(1)若
在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44c45ef0334070fc149b452dee26ae5.png)
上恒成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
;
(2)锐角三角形
中,
,则
;
(3)已知
,直线
与椭圆
恒有公共点,则
;
(4)定义在
上的函数
满足
当
时,
则函数
在
上有最小值
.
其中的真命题是______ .
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219eb990a4344e7434b3b9f2299f8593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44c45ef0334070fc149b452dee26ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6232dc74b15e4acb0ac3482a1cbe6a52.png)
(2)锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdea8b5c19c6d69a385a9e72712c657f.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b97b295f88972ba1c7e3cefda0885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a04ce8afe9a1c1378e1a2872c43df02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85850b1cd5e90ba10fbe290923f51f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d35083f07239c6e61017734f8e8dbd.png)
(4)定义在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b29f5b1455b30c956de523f4a6c1d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b022c75d5b52b499ba1ffabcae8b40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e57779129d1cea174dbbd0f34d0918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35770a47ffcba6bf1d94eceabb416d96.png)
其中的真命题是
您最近一年使用:0次