已知锐角三角形
的三个角
所对的边为
,在
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e9d2b0e99cf908efdc47d7a841616a.png)
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b73c728c21d738b486b08c8e1a210c3.png)
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b5abbfcf623d645c2afd5088c4e87a.png)
三个条件中任选一个完成下列问题(如果使用多个条件按第一个解法计分).
(1)求
;
(2)
,三角形
的面积为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e9d2b0e99cf908efdc47d7a841616a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b73c728c21d738b486b08c8e1a210c3.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b5abbfcf623d645c2afd5088c4e87a.png)
三个条件中任选一个完成下列问题(如果使用多个条件按第一个解法计分).
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cda097a4e7c41100e573d8304ee066.png)
更新时间:2021-05-28 16:24:30
|
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】在
中,角
的对边分别为
,已知
.
(1)求
的值;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98123efc1197cafaba6daf9aea4409cd.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53b24caf312c1cf96d895030fedc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
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适中
(0.65)
解题方法
【推荐1】记
的内角
,
,
的对边分别为
,
,
,已知
,
.
(1)求
的大小;
(2)
为
上一点,从下列条件①、条件②中任选一个作为已知,求线段
的最大值.
条件①:
为
的角平分线;条件②:
为边
上的中线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/fc365d7037709240df6c31f203bd4472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f002f960ec07ea229ed243e2d991d83.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
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适中
(0.65)
【推荐2】如图,在平面四边形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/d30fa607-6db0-4b41-a017-05c926a75297.png?resizew=221)
(1)求
;
(2)若
,
的面积为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb92c95de837a21894048a4f27b4c95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/908497b3549eeb1a53292301b76662a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d4cc87c7466785317f0adefe2f9dd2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/d30fa607-6db0-4b41-a017-05c926a75297.png?resizew=221)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea63228b5011f163bc63348b3d6064fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】记
的内角
的对边分别为
,已知
.
(1)证明:
;
(2)若
的面积为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31001c9f106ec7c293fbc433bbc597e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02746ec8e4220d8b4a174d5e9a711ed2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86279407f407a070f7925563127305e9.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.64)
【推荐2】在三角形ABC中,已知a=7,b=3,c=5,求最大角和sinC.
您最近一年使用:0次