已知:
.求证:
中至少有一个不小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee0536d661db77c938e8a51c572307e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
更新时间:2016-12-03 18:29:03
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】证明:如果存在不全为0的实数s,t,使得
,那么
与
是共线向量;如果
与
不共线,且
,那么
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b453d6b4af8c8bf284ecd34deb2e5603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b453d6b4af8c8bf284ecd34deb2e5603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5deeb332fc7b636fbfb35be5d7f49622.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】已知
、
、
,若实数
、
、
满足条件
,
,
,用反证法证明:
、
、
中至少有一个数不小于0.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd8c7f38cbfa96b7fad20577629c381.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd8c7f38cbfa96b7fad20577629c381.png)
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