已知x与y互为相反数,m与n互为倒数,|a|=1,求2(x+y)
﹣a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391ff3c32f76e5cd68930a73ee08c6ae.png)
更新时间:2019-03-25 14:57:04
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【知识点】 已知式子的值,求代数式的值解读
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如果一个四位数M满足各个数位数字都不为0,且千位数字与百位数字之和为9,将M的千位数字与百位数字组成的两位数记为x,十位数字与个位数字组成的两位数记为y,令
,若
为整数,则称数M是“久久为功数”.
例如:
,∵
,
,
,
为整数,∴
是“久久为功数”;又如:
,∵
,
,
,
不为整数,∴
不是“久久为功数”.
(1)判断1827,4532是否是“久久为功数”,并说明理由;
(2)把一个“久久为功数”M的千位数字记为a,十位数字记为b,个位数字记为c,令
,当
为整数时,求出所有满足条件的M.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceca405e5efaca12a2947c20a94767d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86a7f68370511906270d4508d45cb36.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19160e7170184679197b0bb8aff4c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f480b53ee6bc43e6f2667516cc6be97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ccb12b2fb6e7e0830f0a1cbeaf5d70d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7425b90055ace139c497462709b3d6b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09505ddf9d09bdf4ed847661db751626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19160e7170184679197b0bb8aff4c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b1bce86753bcdc3b44fc533ac33c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78a80bebed22022d0f0026d602b0c31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f191ad0a02344774b8ff015e4e24052f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585a1955751d40e39599c56b64d8c878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664c3c02eab8216bb61401c25630f571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b1bce86753bcdc3b44fc533ac33c4c.png)
(1)判断1827,4532是否是“久久为功数”,并说明理由;
(2)把一个“久久为功数”M的千位数字记为a,十位数字记为b,个位数字记为c,令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b184c4cd7ea60a1cc78041f5ea5b184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c274a229d6f58264ddea723c334758.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1是一个长为
、宽为
的长方形,沿图中虚线用剪刀均分成四块小长方形,然后按图2的形状拼成正方形
.
(1)观察图2,试猜想式子
,
,mn之间的数量关系,并证明你的结论;
(2)根据(1)中的数量关系,解决问题:已知
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/41d53c15-0da2-4142-af66-63ee9041adbb.jpg?resizew=317)
(1)观察图2,试猜想式子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58cf9ababdff83b367721a8d2a4b393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa036015855e69735807708bb036b3c.png)
(2)根据(1)中的数量关系,解决问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285f4a2a0d4c9578ca11f43ff9b23824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c0b3d074cadda1e3911af773521f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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