先化简,再求值:
,其中
、
满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bfe1febf62d1412636878031bdda43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829ae40620c6f36b0f8208306d3d1ed5.png)
更新时间:2018-11-04 17:44:22
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【知识点】 整式的加减中的化简求值解读
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知
(1)设
,是否存在实数
,使得
能化简为
,若能,请求出满足条件的
值;若不能,请说明理由;
(2)若
,且
的值与
无关,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c90f5a7b030421f2a5f6fc855b0606.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00427b8a93646fa1c1d121b534b0361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6ddb3766b5215c115a0abf597598aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d86d438a94756a62a023d20fbd56bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5eeaa30850a2dd1abcb46208ac8b6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5eeaa30850a2dd1abcb46208ac8b6a2.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】化简或求值
(1)若A=-2a2+ab-b3,B=a2-2ab+b3,求A -2B的值.
(2)先化简,再求值:5x2y-3xy2-7(x2y- xy
),其中x=2,y=-1.
(1)若A=-2a2+ab-b3,B=a2-2ab+b3,求A -2B的值.
(2)先化简,再求值:5x2y-3xy2-7(x2y- xy
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
您最近一年使用:0次