“
”是“
”的_______ 条件.(填“充分不必要”,“必要不充分”,“充分必要”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7c54faca6eac8af5309942062058d.png)
更新时间:2016-12-04 00:50:49
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解题方法
【推荐1】已知
:直线
与直线
互相垂直,则
是
的__________ 条件.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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【推荐2】已知条件
,条件
,则非
是非
的________ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b023f60845893e7a0388e52ccff9822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84ae928aca41ddb999dc86a582b592b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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【推荐1】判断对错.
(1)若a>b,则ac>bc一定成立.( )
(2)若a+c>b+d,则a>b,c>d.( )
(1)若a>b,则ac>bc一定成立.
(2)若a+c>b+d,则a>b,c>d.
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【推荐2】当
时,给出以下结论:(1)
;(2)
;(3)
,其中恒成立的序号为_______________
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ce5dd91506d80c4368d48acf9adeb8.png)
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