无字证明来源于《几何原本》第二卷的几何代数法(用几何方法研究代数问题),很多代数的公式或定理都能仅通过图形得以证明、如图,在
中,
为BC边上异于端点的两点,
,且
是边长为b的正三角形,则下列不等式一定成立的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/9049782a-4c32-4ffb-a38f-8bde04b62452.png?resizew=177)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7285930e9a76c46417488adcf0926505.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/9049782a-4c32-4ffb-a38f-8bde04b62452.png?resizew=177)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
更新时间:2023-05-12 11:22:12
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多选题
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适中
(0.65)
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解题方法
【推荐1】在
中,
,
,
,
为边
上一动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e899c486dc49e560fc4aca05e16835b7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在锐角
中,内角A,B,C的对边分别为a,b,c,若
,且
,D是
外一点且B、D在直线AC异侧,
,
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19acddff4cb3831a8e8974e532c05242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3822ef386fe5838e6bda918b626ea514.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b466f14067ec8653e2cbbb2684245b.png)
A.![]() |
B.若![]() |
C.四边形ABCD面积的最小值为![]() |
D.四边形ABCD面积的最大值为![]() |
您最近一年使用:0次