30+
﹣32021×
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b4299339d0bbae028ed4af98344936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c7a34bc27cb4f15329582ca9a146cb.png)
更新时间:2022-09-03 12:02:06
|
相似题推荐
解答题-计算题
|
较易
(0.85)
【推荐1】(1)计算:(2020﹣π)0
﹣|
﹣2|+3tan30°﹣6![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf33c54dac0b9fc5d1800e5df36619b.png)
(2)先化简,再求值:
,其中x是|x|<2的整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e61ee51aa340f4fcf80a9339ad8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf33c54dac0b9fc5d1800e5df36619b.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a574b2279d433acd1e381762387945.png)
您最近一年使用:0次
解答题-计算题
|
较易
(0.85)
【推荐2】(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6276de10635a9e282b1c8578654979.png)
(2)阅读下面的计算过程,并回答下面的问题:
解方程组:
解:②×4,得 4x-2y=16 ③ ......第一步
①-③,得5y=-11......第二步
解得y=
......第三步
把y=
代入②,得x=
......第四步
∴原方程组的解为
......第五步
①以上解题过程中,第二步变形实现了___________的目的,体现了__________的数学思想;
②第_______步开始出现错误,这一步错误的原因是_________________________;
③请写出正确的解题过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6276de10635a9e282b1c8578654979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f7f7314f7ca64954a2e731532c0c53.png)
(2)阅读下面的计算过程,并回答下面的问题:
解方程组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6dd83a4a639f8c96f276105598f3a3.png)
解:②×4,得 4x-2y=16 ③ ......第一步
①-③,得5y=-11......第二步
解得y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c5e7513e40cf128c46797069208907.png)
把y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c5e7513e40cf128c46797069208907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd1a201401e01f2a5d9ddeddc71bdd0.png)
∴原方程组的解为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48744b9966627be193a78e1b3e422b7.png)
①以上解题过程中,第二步变形实现了___________的目的,体现了__________的数学思想;
②第_______步开始出现错误,这一步错误的原因是_________________________;
③请写出正确的解题过程.
您最近一年使用:0次