已知;
,
.求值:
(1)
;
(2)
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8440a752f845314eae2f75be59e6a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0fe0a341958c8fbf5c73a0eadc2b5e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de53d8bf7a1c1bfdadeb4a9c55a16549.png)
更新时间:2021-02-23 14:08:44
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】发现:数轴上从左至右排列的三个数,若每相邻的两个数相差为1,则中间的数的平方与两边的数的积的差为定值.
验证:(1)
______,
______,
______.
探究:(2)设“发现”中的中间的数为n,请论证“发现”中的结论的正确性.
验证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9fb58e886856ac0edd56053af763e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55eab1776b8a54d1b4d3ce891fe82089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3c2746c54f1ebef3f0e604e56acdbf.png)
探究:(2)设“发现”中的中间的数为n,请论证“发现”中的结论的正确性.
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】计算:
(1)
(
-1)-|
-2|; (2)(
+1)(
-1)-
+(
)-1.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f3fae1304b36c0aa24d98d4ae0508b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
您最近一年使用:0次