1 . 化简求值(需要写出计算过程).
(1)若
,求
的值;
(2)化简
并求值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb999ba04c6bce1722a27a368e7488e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0113fd4c7d157757571f9a009e02af.png)
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da046752e318fa606dcf4ff84b49dd4.png)
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2 . 在解方程组
时,甲同学因看错了
的符号,从而求得解集为
,乙同学因看错了
的值,从而求得解集为
,试求
、
、
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2474bdb077bfd5964472b70dfd48de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7403e3b8711e1c53efc2086f7058b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b78cc6ec6be3f2f682614c8185edfac.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)
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3 . 以下是二分法求方程
在区间
内的一个近似解(精确到0.01)的算法的程序框图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/825c83d5-1679-40ff-b7a7-f0e3c22972f6.png?resizew=259)
解:记
,
,
,
在区间
内至少存在一个根.
对于方程
,写出一个区间,使方程在区间内有解,并设计出用二分法求近似解(精确到0.01)的程序框图.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4992e12d772f9c8b993e1497a736c390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb765836721a8b921fa2a05055cac614.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/825c83d5-1679-40ff-b7a7-f0e3c22972f6.png?resizew=259)
解:记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9b84263845d4671d99df13f9055664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a966f7e497af6c5acce17c796220add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bf94c30b9b10602a847e667014dd1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb765836721a8b921fa2a05055cac614.png)
对于方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b1f0344c7ccbe76367756e45121a73.png)
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