直角三角形
的三个顶点分别在等边三角形
的边
上,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839ce94689e556c5d3bbad67071a64de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8be9911089f6b0c48d50ac2eaf2091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5915a17fae38af0b2ef9ed98a81ec7ad.png)
更新时间:2022-10-19 16:48:25
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解答题-问答题
|
适中
(0.65)
【推荐2】已知三棱锥S-ABC中侧棱SA、SB、SC互相垂直,M是底面三角形ABC内一动点.直线MS与SA、SB、SC所成的角分别是
.
(1)证明:
不可能是锐角三角形的三个内角;
(2)设
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da837806c2ff041e56b9bacd3ef41eb.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da837806c2ff041e56b9bacd3ef41eb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233e293b3e622a88480bd75224552fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dab0b38405b5028fd1068dcad886ad8.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】设
的三边分别为
,
,
,且均为整数.若满足
,试求出周长的最小值并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b2ba41772b6d7d11b8283401ba83b0.png)
您最近一年使用:0次