先化简,再求值:(2x2﹣
+3x)﹣4(x﹣x2﹣
),其中x=﹣
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
更新时间:2021-12-29 15:27:42
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【知识点】 整式的加减中的化简求值解读
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解答题-问答题
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较易
(0.85)
【推荐1】老师在黑板上写了一个正确的演算过程,随后用手掌捂住了一个多项式,情景如下:
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125633252786176/3156047196110848/STEM/0831e80365744f9da3531087d2ead16e.png?resizew=62)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f314fc4b3d7eabf48fcb555000f817.png)
(1)求被捂住的多项式.
(2)当
,
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![](https://img.xkw.com/dksih/QBM/2022/12/7/3125633252786176/3156047196110848/STEM/0831e80365744f9da3531087d2ead16e.png?resizew=62)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f314fc4b3d7eabf48fcb555000f817.png)
(1)求被捂住的多项式.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】(1)已知
,求代数式
的值;
(2)已知
,求代数式
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a62c160598bf862be330145ae3b7416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8589a6ea1b08fce0dfa42a939bcb88b2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77664aedca93c07e2a82bed571fd186a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10da2c3c68bad74a8e225dfc22f3fe3a.png)
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