如图,在平面四边形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/6/28/3269484564824064/3300785964572672/STEM/b10de006295f49edab01556cf0848bbd.png?resizew=167)
(1)若
,求
的面积;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756b0fa634c2837459ca579ecd1e7eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b94651d11df3a469d7ac72e6ac74c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0341d5d97dd32312f8cbf89dfed17201.png)
![](https://img.xkw.com/dksih/QBM/2023/6/28/3269484564824064/3300785964572672/STEM/b10de006295f49edab01556cf0848bbd.png?resizew=167)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb566e101935acba966e1b5f7a72e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efa39fd2fbd0ffa55a35daeabe70e4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830544ca6d3d54528b6d3b21c2cb552b.png)
更新时间:2023-08-11 22:09:08
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【推荐2】已知角θ的终边经过点P(a,﹣2),且cosθ=﹣
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118ef77c8f2f861c93a405b7b3dbb6c6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在
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![](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/0d5ef8b38961761228c4807b5acab9a9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1cf290347a97b5fb9a9999ccf597bf6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e1cc6b334edcd3aad471721f9b4d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855aa25ad939a63398ac0f659d9672ea.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5b763032c085a1e60822d8dc1b3605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf155b833ef124089f9668dfd62ec3e.png)
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适中
(0.65)
解题方法
【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5bfa8dffc0052e575f40103ef640fb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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