计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc15e912aa179a94bdd4c2b9abf637e8.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc15e912aa179a94bdd4c2b9abf637e8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee9ed9b6afb5bd0ffdf52315b659457.png)
更新时间:2024-06-05 20:35:29
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【知识点】 实数的混合运算
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解答题-证明题
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较易
(0.85)
【推荐2】如图,已知四边形ABCD中,AB=1,BC=2,CD=2,AD=3,且AB⊥BC,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/909ba7f9-4092-4490-9ce7-01d3bb8c1b42.png?resizew=205)
(1)求证:
;
(2)求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/909ba7f9-4092-4490-9ce7-01d3bb8c1b42.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
(2)求四边形ABCD的面积.
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