阅读材料,解答下列问题:
材料:已知
,求
的值.
小云同学是这样解答的:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820870cb3b834dbee780211a94b25d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14c6bbe2a8747fe3696fe0b57e4bd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c5e7dbc233531a7c2463af4b6a1c4c.png)
,
.
问题:已知
.
(1)求
的值;
(2)求
的值.
材料:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd110dbea359979ea15bd86e65001f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d59f9131720ed2b9d0fa1e84bc95acd.png)
小云同学是这样解答的:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820870cb3b834dbee780211a94b25d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14c6bbe2a8747fe3696fe0b57e4bd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c5e7dbc233531a7c2463af4b6a1c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6a44579bcf861f4de15ab1007dbef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1aa0fe18f7728e027067251e1b255a.png)
问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d11f90663700ba800eac39bd1acdd51.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e47ef0d3dd86403886383dc6e3486e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d4d8f99fdc95d08dcbfae823b5a5b7.png)
更新时间:2024-05-09 06:53:47
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解答题-计算题
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【推荐1】利用乘法公式有时能进行简便计算.
例:102×98=(100+2)(100﹣2)=1002﹣22=10000﹣4=9996
请参考给出的例题,通过简便方法计算:
(1)31×29;
(2)195×205
例:102×98=(100+2)(100﹣2)=1002﹣22=10000﹣4=9996
请参考给出的例题,通过简便方法计算:
(1)31×29;
(2)195×205
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