(1)先化简,再求值:
.其中
且m为整数,请你从中选取一个喜欢的数代入求值.
(2)已知
,
,求下列各式的值:①
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f3c2ce798194c483bf2f60db115268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76acf4494067f57856da8e1ae00f17fe.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982e022d1d403914e5820423af742aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ce6e1a3d321bdb4f2f7ba3c161e075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360b58fb6260fb2de9685ce4861a7d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba80b4687eda33377dfa4b6bf4bd8b05.png)
更新时间:2020-12-29 10:38:25
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【推荐2】如图,图1是长为
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(1)用两种不同方法求
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(2)请直接写出
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(3)利用(2)中结论,完成下列计算:
①若
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②已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d24c9870e0669c89ed9c1dcf2a3c7ef.png)
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![](https://img.xkw.com/dksih/QBM/2023/2/20/3178722421112832/3179586874097664/STEM/79d8f02af2c74375a2e418c0368cd292.png?resizew=289)
(1)用两种不同方法求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118933cede78675413dbafac24ee008c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897aeafa8da0737baa70f64fdf55c269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(3)利用(2)中结论,完成下列计算:
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74aa3a797ca35358297095f741dfc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b04811b9eade779871cee3f7066f61.png)
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②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2cdb20f1141c2a5004b37727bfa95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3628bf2d6a485098786ba5315b097cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6276e82a32e930b09195b74701be87e1.png)
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