先化简,再求值:
(1)
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d07f149af39d1bb7a3a894ae721dac.png)
(2)2(2x2﹣y2)﹣3(x2﹣2 y2),其中
= -1,y =
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b67b48a6fc1f6d973b887d9767a0c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d07f149af39d1bb7a3a894ae721dac.png)
(2)2(2x2﹣y2)﹣3(x2﹣2 y2),其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
更新时间:2019-11-07 16:18:25
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解答题-计算题
|
适中
(0.65)
【推荐1】(1)已知
,求
的值;
(2)先化简,再求值:
,其中
,
;
(3)已知代数式
化简后,不含
项和常数项,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59c502b0fe3776645770043581b0a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1dd0d8be4853cd320add762155a39b.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0c17ccedcb612f78ba5c3194823071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b26c4b6a3f2587e8949efe4ba8bbc0d7.png)
(3)已知代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a059df39134503a7906edb772a4455a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
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