先化简,再求值
(1)已知
,求代数式
+1)-
-1)-7的值
(2)(
+2
)2+(
-2
)(2
-
)-(x+2
)(
-2
)-4
2,其中
=1,
=2
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08587591cfb5275dc14d5bb66a397e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d3e1a36fa776b8df9de66f9f6f1bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f917bc024bc087a41a34b17e8b8d7042.png)
(2)(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
更新时间:2022-04-01 09:44:31
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】若a、b满足|a+1|+(b-3)2=0,求5a2+3b2+2(a2﹣b2)﹣(5a2﹣b2)的值.
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】先化简,再求值:
÷![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc3f71262d89d66fd782f224a52f914.png)
,其中x =4cos30°·sin45°﹣2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cc56d140d873fc5b2304504b7dd921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc3f71262d89d66fd782f224a52f914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489a901a6068097cafc56014aeb35d61.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知:a和b是非零的相反数,c、d互为倒数,m的绝对值2,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba98aa711efa787ceca54fc28db51004.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知a+b=1,ab=2 求代数式a³b+2a²b²+ab³的值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】以3,4,5为边长的三角形是直角三角形,称3,4,5为勾股数组,记为(3,4,5),类似地,还可得到下列勾股数组:(5,12,13),(7,24,25)等.
(1)根据上述三组勾股数的规律,写出第四组勾股数组;
(2)用含n(n为正整数)的数学等式描述上述勾股数组的规律,并证明.
(1)根据上述三组勾股数的规律,写出第四组勾股数组;
(2)用含n(n为正整数)的数学等式描述上述勾股数组的规律,并证明.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】某种植基地有一块长方形和一块正方形实验田,长方形实验田每排种植
株豌豆幼苗,种植了
排,正方形实验田每排种植
株豌豆幼苗,种植了
排,其中
.
(1)求长方形实验田比正方形实验田多种植豌豆幼苗多多少株?
(2)当
,
时,求该种植基地这两块实验田一共种植了多少株豌豆幼苗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2110b00f28682d1ad96097c9eee4af60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6560134e0be8604fa531c25b8e85f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8280bdbac2fa4e050c6ac329f30446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8280bdbac2fa4e050c6ac329f30446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
(1)求长方形实验田比正方形实验田多种植豌豆幼苗多多少株?
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
您最近一年使用:0次