名校
1 . 有下列命题,其中正确命题的序号____________________
①若
,则关于x的一元二次方程
有一个实数根为
.
②函数
通过配方可化为
;
③已知
,
是抛物线
上的相异两点,则当
则
.
④求代数式
的最值,可通过“换元法”求解:设
,则代数式可化为
,利用二次函数的性质可求得最大值为
.
⑤点
,
都在二次函数
的图象上,若
,则m的取值范围为:
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766352f0be38b719621052de92615bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8ab5f9fade787d8219b65608aaa892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c636fd0bf60db3462abfab2ee250382b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f61dacaafcbc000a87510b5ecf2e3a1.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c663466d641b5fdfef1e529d6c330ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166afeb61d5a80366a8ae29c912cd644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65b902385c866d36407cc6baa924f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2d9a35de63dcab1e45dcae3a69eb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49b717d258a16709cdd23432c091624.png)
④求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3f100ee18aee56770381cb804cd7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd0d231fb43d79bf5af70191a718291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688af108d3ce24dcd0d83868211660b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
⑤点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8aeafb2c8b636c447606cfc8b39a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d0b3952afbd3cb2de13e0399d75378.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4e8779b8f81fbdb159edd04533b401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77cbe299f73c164c2c9f3ec529ee5f3e.png)
您最近一年使用:0次
2 . 下列说法中,真命题有( )
①若式子
有意义,则
;
②已知
,则
的补角是
;
③已知
是方程
的一个实数根,则
的值为8;
④在反比例函数
中,若
时,
随
的增大而增大,则
的取值范围是
.
①若式子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1617a873d302306e9dcbeaa1aa06c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c39f02cefccb1589e458dfa4ecdbb9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46b5016f7f2f6725b86aafd38e02c9c.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b331498d6ef1a5185f4a0aa691bee5de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
④在反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf319e356d95444e3704cc551d62364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9589f30699d1a766f1e700cc88a344.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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