先化简再求值
(1)
,其中
.
(2)已知
求:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2e0881dea2b5d4938ac48b2b1782d.png)
(3)
.其中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f3fa679bb55ded25a9b72a8e788cb1.png)
(4)
,其中
、
满足
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce7f78cf8a8db67f4aff0ff6a29349a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47debd5453c65c1b8c21bc1c0da8014f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2e0881dea2b5d4938ac48b2b1782d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04de40194081271f7cfb65f6f350c19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f3fa679bb55ded25a9b72a8e788cb1.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98fc03f646b9531c6572292cfe57353f.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/d2e3a6bd342beb0cfb0809fc1ef962ea.png)
更新时间:2023-12-30 21:00:16
|
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解答题-计算题
|
较易
(0.85)
【推荐1】下面是小明计算
的过程,请你认真观察,回答问题.
解:原式
……第一步
……第二步
……第三步
……第四步
……第五步
(1)第一步和第三步的依据分别是________、________.
(2)你认为小明的计算是否正确?如果错误,请指出是哪一步错了,并直接写出正确的结果.如果正确,不用作任何解释.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850379d798802e9fccda29726b0edc1f.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697a1f3435f19d2e95d03afeeef73097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa2a8e4a07aef7c0e3f65f2b9f6c89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee441eab61fff74c81d9c00601bcd31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e029393c007bdf0a77a8c4af598a724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa7439a85511b3911f4dc1227377604.png)
(1)第一步和第三步的依据分别是________、________.
(2)你认为小明的计算是否正确?如果错误,请指出是哪一步错了,并直接写出正确的结果.如果正确,不用作任何解释.
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