在
中,
,
,则下列哪几个等式是成立的?
(1)
;
(2)
;
(3)
;
(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29149cfbc1d0a54024f645947db294a2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dbaaa913250200743ecb336cd706ab.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d17d8e44cf1e1b566babce8d26703d8.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154f9e1f851d9d0bb2f43e5265e18c0e.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-12 10:10:22
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【推荐1】已知菱形ABCD的边长为1.且
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【推荐2】△ABC中,
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【推荐1】如图,在
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda7db5bfda626b22cf2b89946b2d3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46927389fcb9c1ab2d8fb4bc1e60793a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f24d6ee7400657f7ec878e202ca46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
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