计算下列各题:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7da60a0a77e5a9948b37d1c0fd93c7.png)
(2)解方程
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7da60a0a77e5a9948b37d1c0fd93c7.png)
(2)解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448a9385999b0804318f6242aace448f.png)
更新时间:2023-02-08 12:34:21
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相似题推荐
解答题-计算题
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较易
(0.85)
【推荐1】计算:
(1)4﹣28.5﹣(﹣29.5)+(﹣24)
(2)
(1)4﹣28.5﹣(﹣29.5)+(﹣24)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac704347a198e95b2c0cb0bb687a9be9.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】阅读材料:求
.
首先设
①,
则
②,
得
,
即
.
以上解法,在数列求和中,我们称之为“错位相减法”.
请你根据上面的材料,解决下列问题:
(1)
.
(2)
;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f185a7d0388db7fc9af4c2de6dc28b.png)
首先设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577a86de6f2b5e53630717170509ffb1.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043df7dce35af5bb9ce50601767bca89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b3617db740a784dc02e35309c9c585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae18195d0b21f258d37dea37bde03560.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da949cb31298062c04d3e126ed79d703.png)
以上解法,在数列求和中,我们称之为“错位相减法”.
请你根据上面的材料,解决下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e228f7dab00dd1587b271e51002ea1df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9f0c6c58827ee06be3011f958cb3b5.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a78b00ab378dd8612d22dfca3d5ac1.png)
您最近一年使用:0次