如图,在平面五边形
中,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760651331125248/2778309296865280/STEM/140903369a7f4c31bf2fd888c91921e8.png?resizew=178)
(1)求
的值;
(2)求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9100eadeba8de498bad6bc9189433d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b755ee4dda4a72063c6fba125720a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2971f739c3762cc3dff09242516c1c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7757dac3098323183ed3f8c98c6244.png)
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760651331125248/2778309296865280/STEM/140903369a7f4c31bf2fd888c91921e8.png?resizew=178)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7b02542c53b467d51c9a07ea6fb1d4.png)
更新时间:2021-08-03 17:47:38
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解答题-问答题
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适中
(0.65)
【推荐1】已知向量
,
,且
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd6fc707cda4b07c768a9b99beded82.png)
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(1)求
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26280e4c41f578a29e406cd6afe03e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a23e40389f07e0006a0146155c7540c.png)
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解答题-计算题
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适中
(0.65)
解题方法
【推荐2】在①
;②
;③
这三个条件中任选两个,求值:
(1)
;
(2)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a310b7f37ffaa1ac1809320a3e7dfc72.png)
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(1)
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(2)
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【推荐3】已知
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解答题-问答题
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适中
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【推荐1】已知:在
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,
所对的边长,
是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/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/1110559eaac39a016c95880c08de39f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57003e380cf41982c78289db1c4d68fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7933389f3ab945c1f8a7f0ab16f9c3db.png)
(Ⅰ)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b098170b32a303e70d7f6d767f668f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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适中
(0.65)
【推荐2】在
中,角
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的对边分别为
、
、
,已知
.
(1)求
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(2)求
的值.
![](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/8b8cea48ef944a4465b9d3273c19a9e4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
解答题-问答题
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适中
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名校
解题方法
【推荐2】已知
为
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(1)求角
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(2)若
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中点,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef91838e83807c6b7f125a535bb3c2f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a70d446e6fc756806938596817fd1bd.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56059de799b7ae9901ba6f2bae9c52b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d556d0f9e5727cc97c01554f165e2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次