名校
1 . 阅读下列解题过程:请回答下列问题:
,
,
.
(1)观察上面的解答过程,请写出
;
(2)请你用含n(n为正整数)的关系式表示上述各式子的变形规律: ;
(3)利用上面的解法,请化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60bd8355234c4e1ff57e6ee4bb992a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b426636049a297393dd32b9937f7cdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67603ece99fd3db344fbb511bb523f1e.png)
(1)观察上面的解答过程,请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf453321aa98702ced9fcaab34b92b66.png)
(2)请你用含n(n为正整数)的关系式表示上述各式子的变形规律: ;
(3)利用上面的解法,请化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3082cbdaaa4e0fb389769b74323d7081.png)
您最近一年使用:0次
2 . 若一个正整数x能表示成
(a,b是正整数,且
)的形式,则称这个数为“优美数”,a与b是x的一个平方差分解.
例如:因为
,所以5是“优美数”,3与2是5的平方差分解;
再如:
也是“优美数”.
∵
(其中x,y是正整数),所以M也是“优美数”,
与y是M的一个平方差分解.
(1)判断:48是否是“优美数”,如果是,请写出48的所有平方差分解;如果不是,说明理由.
(2)已知
(x,y是正整数,k是常数,且
),要使N是“优美数”,试求出符合条件的一个k值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
例如:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5290669379b5c2738c7b798cc97ba4.png)
再如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50270281d0e378b1fe55241366d9c1f9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39fc6bc009ab836118cf63785f0836e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc33d2c0c40b76cff4dde10c38b802c.png)
(1)判断:48是否是“优美数”,如果是,请写出48的所有平方差分解;如果不是,说明理由.
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6578a52c73a91030dd445f5f41fc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edb1f6161f659110ff33f30e5e4c187.png)
您最近一年使用:0次
3 . 计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91ce923efb731e6541d1992adb050d1.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4a63569cda4a0e119e4d07c51ce2d9.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482da4bd707d5fa6d6c14d1d1d47586b.png)
(4)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91ce923efb731e6541d1992adb050d1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4a63569cda4a0e119e4d07c51ce2d9.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482da4bd707d5fa6d6c14d1d1d47586b.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66a2e355525e2f52361d51d91e2ed95.png)
您最近一年使用:0次
4 . 定义
,如
.已知
(m为常数),
.
(1)若A的代数式中不含x的一次项,求m的值;
(2)若A中的m满足
,计算
的结果.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1544d0c9166aadbbc7a005573f3d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6791134f1dcc3dcf4458fe7f1eaeca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a00f32006b7c3aa8554a4339e6ae968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702d1a83794da3cff2891343f0ee2fdb.png)
(1)若A的代数式中不含x的一次项,求m的值;
(2)若A中的m满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b7b875e9d0f19780e4ccc8f6874d27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df69c6a544f62a016490b012c353ae7.png)
您最近一年使用:0次
5 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd69a3194f4b1ce9c390179edd6372b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e9222ffc26c0e6bfbf252ab5d8a520.png)
您最近一年使用:0次
6 . 运用整体思想解决数学问题,有时会使我们的解题更加简便快捷.例如:已知
,求
的值.解:
,当
时,原式
.请你借鉴上面的解题经验,解决下列问题:
(1)若
,则
______;
(2)若关于x,y的方程组
的解为
现有关于m,n的方程组
,求代数式
的值;
(3)如图,将
纸片沿
折叠,使点
落在点
的位置.
①如图1,点
在
内部,请你猜想
与
之间有怎样的数量关系,并说明理由;
②如图2,点
在
外部,再将
纸片沿
折叠,点C恰好也落在点N的位置,若
,
,则
____________(用m、n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba8a4b6fbfa194a07c0d5f0b1bd1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ebd1734ead1220ff0d0612da32d5e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3871379335c3c9409c7369abbba586c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba8a4b6fbfa194a07c0d5f0b1bd1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e11a2420bcb32522881aaeddb404f3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d873405c90a3e9bc1b8f52bcd2852e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90fc65dd9360c2ded167df709b047ca.png)
(2)若关于x,y的方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a72c1f09c4b571d6f261f86f9d3b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485874402b318268aa6ef0eadf270a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4df998f4e31d587f10e9304a74f73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b2029464b8dac1e192ccfa5e9c0266.png)
(3)如图,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1abfc5f8a68337146228441531d442.png)
②如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a0a79991aec8c223a3220f3631e8ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c9b63df0ce09985f60de859b55a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7cbe31f9c11d236c7c9611f207f465.png)
您最近一年使用:0次
7 . 现规定:若m、n满足
,则称m、n为“固距组合”,记为
;若a、
满足
,则称a、b为“合拍组合”,记为
.
(1)在
中
的值为______;
(2)在
中,
______;(用含
的代数式表示)
(3)若a、b、m、n四个数满足
、
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca9c6eae89ae8052c5d7aa34357cddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd8466b576ad34d6ef492599940f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126db3b9c2f680708b41aae3ae1a1c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a3ea9f0c75151f40abcc558569e209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e014d3b55d220104538deebe7aba3b.png)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f3c451e591e1613012bac2b32b7848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e014d3b55d220104538deebe7aba3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)若a、b、m、n四个数满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd8466b576ad34d6ef492599940f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e014d3b55d220104538deebe7aba3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42732663d71d6e9ca4d40f1a114e81d5.png)
您最近一年使用:0次
名校
8 . 如果一个正整数能表示为两个连续正奇数的平方差,那么称这个正整数为“正巧数”.例如:
,
,
,因此8,16,24都是“正巧数”.
(1)写出一个30到50之间的“正巧数”;
(2)设两个连续正奇数为
和
(其中k是正整数),由它们构成的“正巧数”能被8整除吗?如果能,请说明理由;如果不能,请举例说明.
(3)m,n为正整数,且
,若
是“正巧数”,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6596702d0c35fec938e159c7b4702ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe86423fa7639e143883a4a4e02a7a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800cbf30ddc20b1bda7445957a0e33b5.png)
(1)写出一个30到50之间的“正巧数”;
(2)设两个连续正奇数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897d8f6cf00391f1b3ff70432f0121b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394aee19f94c2b70fcce1d69b31dc7fd.png)
(3)m,n为正整数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5e4aeb59a89a39f04e23a43f18cf56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72850427e83ff19a24305783e080b280.png)
您最近一年使用:0次
9 . 计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9523776c0d19c5a6bc8b4585ce236.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16f620712917e33b8c0a3d10f2a6080.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780dc3ce2e461c628e8a24b967b8d41e.png)
(4)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9523776c0d19c5a6bc8b4585ce236.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16f620712917e33b8c0a3d10f2a6080.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780dc3ce2e461c628e8a24b967b8d41e.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d0eb73062bb1a505e168db2ca3357f.png)
您最近一年使用:0次
10 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56fdf45a0977490ec08d8b37a891ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6afef4584542103a3a08a5fe0edae9b.png)
您最近一年使用:0次