若一个整数能表示成
(a、b是正整数)的形式,则称这个数为“吉祥数”.例如,2是“吉祥数”,因为2=
所以2是“吉祥数”,再如,因为M=x
+2xy+2y
=(x+y)
+y
(x+y,y是正整数),所以M也是“吉祥数”.
(1)请你写一个最小的三位“吉祥数”是_____,并判断40______“吉祥数”.(填是或不是);
(2)已知S=x
+y
+2x−6y+k(x、y是正整数,k是常数),要使S为“吉祥数”,试求出符合条件的一个k值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1add43472fb48c3fa066febe1dbe392d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
(1)请你写一个最小的三位“吉祥数”是_____,并判断40______“吉祥数”.(填是或不是);
(2)已知S=x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
更新时间:2019-12-03 18:07:14
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【知识点】 新定义下的实数运算
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】阅读材料:对于平面直角坐标系
中的图形G和图形G上的任意点
,给出如下定义:将点
平移到
称为将点P进行“t型平移”,点
称为将点P进行“t型平移”的对应点;将图形G上的所有点进行“t型平移”称为将图形G进行“t型平移”.
例如:将点
平移到
称为将点P进行“1型平移”,将点
平移到
称为将点P进行“
型平移”.
已知点
和点
.
进行“1型平移”后的对应点
的坐标为___________;
(2)①将线段AB进行“
型平移”后得到线段
,点
,
,
中,在线段
上的点是___________;
②若线段AB进行“t型平移”后与坐标轴有公共点,则t的取值范围是___________;
(3)已知点
,
,点M是线段CD上的一个动点,将点B进行“t型平移”后得到的对应点为
,当t的取值范围是___________时,
的最小值保持不变.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b3e60f3785e37a3828d80df7485fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
例如:将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950803308539949f1bb803faa4f6ff74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a854ba810b3a77401a28dcfdbf91888b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49a31f8e8dba418bd5d886998ef8d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(2)①将线段AB进行“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6665dc77d95a288e8b1d4e56b5bf0b7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01555ea1bf1b6e1d6ccdedb6f358846d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c18b1add806f0b8f24a2f253f10177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
②若线段AB进行“t型平移”后与坐标轴有公共点,则t的取值范围是___________;
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c9f25703e265026af2d481e64414d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00039426f8452b2e934d2c0ec27ceac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f00d88b9f850dea09aa8c682b9d610.png)
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解答题-问答题
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适中
(0.65)
【推荐2】在实数范围内定义一种新运算“#”,其规则时:a#b=a2﹣b2.
(1)求4#3与(﹣1)#(﹣2)的值;
(2)求(x+2)#5=0中的x值.
(1)求4#3与(﹣1)#(﹣2)的值;
(2)求(x+2)#5=0中的x值.
您最近一年使用:0次